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Pick out the words underlined part is pronounced differently from that of the others.1. A. message B. begin C. repeat D. repair2. A. dinner B. drink C. child D. children3. A. ready B. meat C. defeat D. beat4. A. kitchen B. history C. time D. finish5. A. arrive B. fit C. fine D. drive Pick out the words that have the stress different from that of the others.6. A. usually B. continue C. family D. buffalo7. A. tobacco B. breakfast C. children D. several8. A. biology B. alarm C. transplant D....
Đọc tiếp

Pick out the words underlined part is pronounced differently from that of the others.

1. A. message B. begin C. repeat D. repair

2. A. dinner B. drink C. child D. children

3. A. ready B. meat C. defeat D. beat

4. A. kitchen B. history C. time D. finish

5. A. arrive B. fit C. fine D. drive

 

Pick out the words that have the stress different from that of the others.

6. A. usually B. continue C. family D. buffalo

7. A. tobacco B. breakfast C. children D. several

8. A. biology B. alarm C. transplant D. sometimes

9. A. airport B. passenger C. technology D. chemistry

10. A. routine B. tobacco C. neighbor D. experience

 

Choose the best answer.

11. I know ______ how she felt.

A. exact B. exactly C. exactness D. exacting

12. I felt quite _______ with my day’s work.

A. satisfy B. satisfactory C. satisfied D. satisfaction

13. I was late for school this morning because my alarm did not ____.

A. go away B. go up C. go on D. go off

14. I have not met him since he ______ school.

A. left B. was leaving C. had left D. has left

15. My house isn’t very far _____ school, so I usually go to school _____ bike.

A. from- on B. away - in C. of - by D. from - by

16. _____ films should be made for school.

A. Educational B. Educating C. Educated D. Education

17. Mr. Lam goes to work on foot once a week. It means he ____ walks to work.

A. never B. sometimes C. often D. usually

18. When I was a child, I usually ______ fishing with my brother.

A. go B. went C. gone D. used to go

19. We _____ dinner at home on Saturdays.

A. haven’t had B. didn’t had C. doesn’t have D. don’t have

20. _______ class allows students to acquire knowledge about living things.

A. Geography B. Chemistry C. Biology D. History

21. The contented smile on her face shows that she finally passed the exam.

A. bored B. boring C. happy D. disappointed

22. Now I don’t take the bus to school as I ____.

A. used to B. did C. took D. was

23. It ___ me 15 minutes to get to school every morning.

A. takes B. took C. spends D. spent

24. - “_______ do you often go to school?”

- “At 6.30 every morning.”

A. How B. What time C. Who D. With whom

25. He’s not really interested in ____ on the farm.

A. to work B. being worked C. working D. worked

 

Choose the underlined part among A, B, C or D that needs correcting.

26. Mr. Vy leaves the house at a quarter past five and arrive in the field at exactly 5.30.

A B C D

27. We haven’t seen Jim since he has returned the countryside.

A B C D

28. I spend 20 minutes to read books every day.

A B C D

29. I enjoy to talk with my classmates about their future plans.

A B C D

30. David immediate comes home after finishing school.

A B C D

 

Choose the correct sentence among A, B, C or D which has the same meaning as the given one.

31. The milk was too sour to drink.

A. The milk was sour in order to drink. B. The milk was very sour to be drunk.

C. The milk wasn’t fresh enough to drink. D. The milk wasn’t enough fresh to drink.

32. We started to write to each other two years ago.

A. We used to write to each other for two years.

B. We used to write to each other since two years.

C. We’ve written to each other for two years.

D. We’ve written to each other since two years.

33. He last had his eyes tested a year ago.

A. He has not had his eyes tested for a year. B. He had not had his eyes tested for a year.

C. He had not tested his eyes for a year. D. He did not have any tests on his eyes in a year

34. Mary is contented with what she does.

A. What she does doesn’t make her pleased.

B. Mary is satisfied with what she does.

C. Whatever Mary does, she makes nobody pleased.

D. She feels happy when she does something.

35. My brother always drives to work.

A. My brother always goes to work on the car. B. My brother always gets to work by car.

C. My brother always repairs cars at work. D. My brother’s driver is always off work.

 

Read the passage below and choose one correct answer for each question.

My name is Seumas McSporran and I am a very busy man. I am 60 years old and I have thirteen jobs. I am a postman, a politician, a fireman, a taxi driver, a school- bus driver, a boatman, an ambulance man, an accountant, a petrol attendant, and an undertaker. Also, I and my wife, Margaret, have a shop and a small hotel.

I live and work on the island of Gigha in the west of Scotland. Only 20 people live there but in summer, 150 tourists come by boat every day.

Every weekday I get up at 6:00 and make breakfast for the hotel guests. At 8.00 I drive the island’s children to school. At 9:00 I collect the post from the boat and deliver it to all

houses on the island. I also deliver beer to the island’s only pub. Then I help Margaret in the shop.

My wife likes being busy, too. We never have holidays and we don’t watch television. In the evenings Margaret makes supper and I do the accounts. At 10:00 we have a glass of wine and then we go to bed. Perhaps our life isn’t very exciting, but we like it.

 

36. Mr. McSporron does all the following jobs EXCEPT ______

A. a firefighter B. a driver C. a farmer D. a mailman

37. Gigha is the name of _______.

A. his wife B. his hotel

C. the shop where they work D. the island where they live

38. Tourists ________ to the island.

A. sail B. fly C. swim D. drive

39. The word “it” in paragraph 3 refers to the ______.

A. beer B. post C. boat D. pub

40. According to the passage which is TRUE about Seumas McSporran?

A. He likes the job as a postman most. B. He and his wife go on holiday every year.

C. He does the accounts in the evenings. D. He goes to bed very late.

 

Read the following passage and choose the best option for each blank.

 

The 29th of August in 2006 is a day I shall never forget. On that day, I stared ___41__ in the face. Our flight was ___42__ to leave at 10:30 a.m., and arrived at the airport with plenty of time to spare. We started boarding 10:00 a.m. Most of us were holiday makers and there ___43__ a lot of laughing and joking going on. It was raining slightly, but visibility was good and the plane ___44__ on time. The cabin staff were just beginning to bring round the duty- free goods when the plane began ___45__ . At first, we thought we had just hit bad weather. We were told to sit down and to fasten our seat belts. Then suddenly, the front of the plane seemed to ___46__ and we realized we were speeding towards the ground. People screamed in ___47__. Strangers joined hands and prayed. We thought we had only minutes to live. Then, just when we had __48__ all hope, we felt the plane level out, and slowly we began to gain height. A few minutes later, the pilot announced that everything was now ___49__ control, and we all began to clap and cheer hysterically. Twenty minutes ___50__ we landed safely.

41. A. die B. dead C. death D. deaden

42. A. due B. thought C. plan D. bound

43. A. was B. had C. were D. has been

44. A. went off B. got on C. got in D. took off

45. A. to shake B. shaking C. shake D. for shaking

46. A. chop B. dip C. down D. reduce

47. A. danger B. risk C. afraid D. panic

48. A. given up B. given back C. brought up D. brought back

49. A. of B. with C. under D. below

50. A. after B. later C. behind D. then

BJECTIVE PRACTICE TEST OF UNIT 2

 

Choose the word whose underlined part is pronounced differently from the rest

1: A. son B. above C. convenience D. wonderful

2: A. umbrella B. cup C. but D. put

3: A. marvel B. package C. father D. guitar

4: A. garage B. married C. father D. target

5: A. addition B. important C. master D. embarrass

 

Choose the best option (A, B, C, or D) to complete the following passage:

Every year, students in many (6) _____learn English. (7) _____of these students are young children. Others are teenagers. Many are adults. Some learn at school, others study (8) _____ themselves. A few learn English just by (9) _____ the language in films, (10) _____ television, in the office, or among their friends. But not many are lucky to do that. Most people must work hard to learn another language.

6: A. countries B. homes C. house D. families

7: A. None B. Some C. Any D. All

8: A. for B. with C. by D. on

9: A. hear B. heard C. to hear D. hearing

10: A. on B. at C. in D. to

 

Choose the best option (A, B, C, or D) to complete the following sentences:

11: A: “_____ will she spend her summer holidays?”

B: “In Hanoi.”

A. When B. Where C. How D. With whom

12: A: “What’s your favourite ______ at school?”

B: “English, of course.”

A. subject B. topic C. lesson D. theme

13: His pronunciation causes me many _____.

A. difficult B. difficulty C. difficultly D. difficulties

14: A: “ _____novel are you reading?”

B: “Tam's.”

A. Who B. Which C. Whose D. that

15: We look forward ________ the Olympics.

A. at watching B. to watching C. with watch D. watching

16: I am interested ______ your class.

A. to take B. to taking C. in taking D. in took

17: They enjoy_______ movies.

A. watching B. watch C. to watch D. to watching

18: I need ______.

A. studying B. to study C. in study D. to studying

19: We agreed _____ together.

A. working B. to work C. worked D. to working

20: She refuses_____ to her mother

A. listen B. to listening C. to listen D. listening

21: I was delighted _____ my old friends again.

A. to see B. seeing C. saw D. be seen

22: A: “How long will the seminar last?”

B: “______.”

A. for 4 hours B. for 4 hour.

C. about 4 o’clock D. since 4 hours.

23: I remember __ him said that he would come but he is absent now.

A hear B to hear C hearing D heard

24: The criminal admits ______ the money.

A. on taking B. take C. to take D. taking

25: Most girls have a very narrow view of the world, don’t you think?

A. limited B. tiny C. small D. poor

26: Hung: “Thank you very much for a lovely party.”

Hoa: “_____.”

A. Cheers B. Have a good day C. You’re welcome D. Thanks

27: A: “How _____do you go to the countryside?”

B: “Once a year”

A. often B. long C. far D. fast

28: It’s no use ____to him about our problem because he is never willing ____us.

A to talk, help B talk, helping C talking, help D talking, to help

29: A sportsman needs ____calm under pressure.

A remain B to remain C remaining D remained

30: A: “How_____ is it from your house to the market?”

B: “About 2 kms”

A. fast B. far C. long D. much

31: The students in this class were made _____ very hard.

A. learn B. to learn C. learning D. having learnt

32: A: “What are they laughing at?”

B: “ _____”

A. Sorry, I am fine. B. Oh, I don’t like them

C. Well, not at all. D. Oh, It is about Henry’s jokes

33: A: “Could you help me move this television, please?”

B: “ ______”

A. No, thanks. B. Yes, of course.

C. No, I’m rather busy. D. Yes, I am.

34: How _____were you in the mountains?

A. long B. far C. old D. fast

35: I regret _____ you that your application has been denied.

A. inform B. to have informed C. informing D. to inform

 

Error identification

36: I decided changing jobs because my boss makes me work overtime

A B C D

37: In order to not forget things, I put a string around my finger

A B C D

38: I succeeded in to find a job, so my parents didn’t make me go to college.

A B C D

39: Get more exercise appears to be the best way to lose weight.

A B C D

40: Let's stop to watch so much TV so that we can read or go out instead.

A B C D

Read the passage bellow, and then choose the best option

The relationship between a teacher and a student can be good or bad, helpful or harmful. Either way, the relationship can affect the students for the rest of his life.

In order to have a good teacher-student relationship, it is important that the teacher and the student respect each other. If the teacher is too strict, he frightens the student. The student will not learn well. On the other hand, if the teacher is too friendly and permissive, the student may become lazy and stop working hard. The teacher’s attitude and approach should be

between these two extremes. He should encourage the students without forcing or punishing him to learn. He needs patience and understanding. It is part of the teacher’s job to help develop a good positive attitude in his students. As for the student, in order to have a good relationship with his teacher, he must always show his proper respect. He should be eager to learn and willing to work hard. If he learns from the teacher modestly, he will be able to profit fully from his teacher’s knowledge and assistance.

41: The relationship between a teacher and a student is considered very important because it _____.

A. can be either good or bad B. it’s very harmful to the student

C. makes the student unsafe D. has great influence on the student’s life

42: One of the most important factors for a good teacher-student relationship is the mutual _____.

A. responsibility B. respect C. support D. understanding

43: In order to have a good teacher-student relationship, the teacher _____.

A. should force the student to learn B. needs patience and understanding

C. should be too friendly and permissive D. ought to strict

44: In order to have a good teacher-student relationship, the student _____.

A. must be a hard-working person B. must always support the teacher

C. must always be a gifted person D. must always be an excellent person

45: According to the passage it’s true that _____.

A. the student always profit fully from his teacher

B. the student must thank for his teacher’s knowledge and assistance

C. the student must always show his proper respect to his teacher

D. the teacher himself needs to develop a good positive attitude

 

Choose the best option that has the same meaning as the original sentence.

46: We hope to receive a message from our mutual friend, Susan.

A. We wish we received a message from our mutual friend, Susan.

B. We’re looking forward to receiving a message from our mutual friend, Susan.

C. Our mutual friend, Susan, whom we hope to receive a message.

D. Susan, who’s our mutual friend, is hoped to receive a message from.

47: You should have read the instruction carefully.

A. What did you read the instruction carefully for?

B. Why should you read the instruction carefully?

C. How should you read the instruction?

D. Why didn’t you read the instruction carefully?

48: We really do not want to hear your explanation again.

A. Your explanation really makes us feel sorry.

B. We would rather not ask you to give any explanation again.

C. We are fed up with hearing your explanation again.

D. We are extremely sorry for hearing your explanation again.

49: It’s a waste of time to persuade Johnny to change his mind.

A. We spend mush time persuading Johnny to change his mind.

B. It takes us a lot of time to persuade Johnny to change his mind.

C. Persuading Johnny to change his mind is useful.

D. It’s worthless trying to persuade Johnny to change his mind.

50: Minh wishes he had taken part in the English competition last week.

A. Minh really enjoyed attending the English competition last week.

B. Minh would never mind not attending the English competition last week.

C. Minh now regrets not having attended the English competition last week.

D. Not attending the English competition last week was Minh’s big mistake.

OBJECTIVE PRACTICE TEST OF UNIT 3

Choose the one word that best completes each sentence

1. Nowadays more and more young people want to have a university……………

A. educational B. education C. educated D. educator

2. -Marie Curie was a brilliant student

A. brave B. hardworking C. intelligent D. satisfied

3. When she was young, she received some………….training from her father.

A. science B. scientist C. scientifically D. scientific

4. The purpose of this test is to…………..the weight of the chemical element.

A. find out B. measure C. ease D. interrupt

5. Marie Curie was a /an…………woman. Her real joy was easing human suffering.

A. quiet B. humane C. generous D. tragic

6………….aids must be sent to the Lybian refugees at once.

A. Human B. Humanity C. Humanism D. Humanitarian

7. Jane graduated from Paris medical school with flying colours

A. with difficulty B. with very high grades

C. without success D. due to her hard work

8. Sue is………….for her age. She behaves like an adult.

A. romantic B. contented C. interested D. mature

9.Marie Curie was………….a Nobel prize in Chemistry in 1911.

A. received B. obtained C. gained D. awarded

10. David Brown worked ………a tourist guide from June 1999 to December 2002. He really liked his job.

A. for B. on C. as D. with

11. We ……..the lesson thoroughly because our teacher ………….. it twice.

A. will understand / was explaining B. had understood / explained

C. understood / had explained D. were understanding / has explained

12. Before Peter ………….. to London last week, he ……… in Paris for more than ten years.

A. has moved / was living B. was moving / lived

C. would move / has lived D. moved / had lived

13. Tom ………. the match although he …………before.

A. won / didn’t practise B. won / not practised

C. won / didn’t practise D. won / hadn’t practised

14. I ……… as a hotel telephonist from May 2001 to May 2011.

A. had worked B. would work

C. worked D. get used to working

15. She was disappointed with the exam result. She ……… a bad mark before.

A. ever had got B. had ever got

C. never had got D. had never got

16. After he ………. his holiday in London, he ….. to learn English.

A. had spent / wanted B. spent / wanted

C. had spent / had wanted C. has spent / wanted

17. When she …………., the match ………………

A. had arrived / had already started B. had arrived / already started

C. arrived / had already started D. arrived / already started

18. The sky …….. black for some times before the rain …….. to fall.

A. had been / began B. had been / had began

C. was / began D. was / had began

19. I ………… you the work to do again because ……. it badly.

A. gave / did B. gave / have done

C. gave / done D. gave / had done

20. By the age of 34, my brother ………… his own business.

A. started B. has started

C. had started D. would start

 

Choose the word that has the underlined letter(s) pronounced differently from the others.

21. A. sea B. disease C. instead D. team

22. A. Africa B. famous C. place D. vacation

23. A. brilliant B. tragic C. award D. mature

24. A. death B. sea C . receive D. teacher

25. A. prevent B. expensive C. determine D. English

 

Choose the word whose main stress is placed differently from the others.

26. A. background B. chemistry C. harbor D. scientific

27. A. award B. begin C. marry D. determine

28. A. ambitious B. humane C. intelligent D. private

29. A. champion B. romantic C. professor D. extremely

30. A. interrupt B. condition C. education D. mathematics

 

Fill in the blank with appropriate word or phrase.

Alexander Gramham Bell was born (31)___ Edinburgh, Scotland, in the (32)____ century, and later came to (33)____ United States. Several members did a great deal to encourage him in the field of (34)____ . In American, he worked with deaf-mute at Boston University. Soon, he started (35)____ with ways of transmitting speech over a long distance. This led to the invention of the telephone.

31. A. in B. at C. on D . up

32. A. nineteen B. nineteenth C. nineteen D .nineteenth

33. A. a B. an C. the D . no article

34. A. scientist B. scientific C. scientists D . science

35. A. experiment B. experimental C. experimented D . experiments

 

 

1
7 tháng 7 2019

dài như v rồi ai làm cho :)??

15 tháng 6 2019

1. recovering

2. saved

3. panic

4. ran

5.sign

6. rescue

7. catch

15 tháng 6 2019

1....... recovering...........

2. ........saved.....

3.......... panic............

4..........ran................

5...................sign................

6. rescue

7. catch

13 tháng 6 2019

1. Never have I been to Liverpool in my life.

2. My father speaks hardly any French.

3. How long have you known him?

4. They had a three-day trip

5.  In case it rain hard this afternoon, take the rain coat with you

20 tháng 10 2021

1. Never in my life have I been to Liverpool.

2. My father speaks hardly any French.

3. How long have you known him?

4. They had a three-day trip.

5.  In case it rains hard this afternoon, take the rain coat with you

tôi biết bạn nhưng bạn không biết

1 the aim of the culture festival is ....... friendship between the two countries A . promote       B . promoting             C . to promote               D. being promoted2. people he ......... turned out to be only fair - weather friends A. trusted              B. has trusted             C was trusting               D had trusted 3. How can you let such a silly incident ............ your friendship A. wreck             B to wreck                C wrecking               D that wrecks  4. it...
Đọc tiếp

1 the aim of the culture festival is ....... friendship between the two countries 

A . promote       B . promoting             C . to promote               D. being promoted

2. people he ......... turned out to be only fair - weather friends 

A. trusted              B. has trusted             C was trusting               D had trusted 

3. How can you let such a silly incident ............ your friendship 

A. wreck             B to wreck                C wrecking               D that wrecks  

4. it has  become necessary ....... water in the metropolitan area because of the severe drought 

A. rationing              B ration                   C to ration              D to have rationed 

5 All the pasengers were made.............. their seat belts during the turbulence 

A. buckle                     B to buckle                  C buckling                   D for buckling 

6. .......... good ice cream , you need to use a lot of cream 

A Make                  B making                 C to make                        D for make 

7 , i got my friend ........... her car for the weekend 

A . to let me to borrow            B to let me borrow              C let me borrow                 D let me to borrow 

8 they .......... good friends , but they have fallen out recently

A . used to be                  B would be                 C were              D are

 

1
17 tháng 5 2019

1 the aim of the culture festival is ....... friendship between the two countries 

A . promote       B . promoting             C . to promote               D. being promoted

2. people he ......... turned out to be only fair - weather friends 

A. trusted              B. has trusted             C was trusting               D had trusted 

3. How can you let such a silly incident ............ your friendship 

A. wreck             B to wreck                C wrecking               D that wrecks  

4. it has  become necessary ....... water in the metropolitan area because of the severe drought 

A. rationing              B ration                   C to ration              D to have rationed 

5 All the pasengers were made.............. their seat belts during the turbulence 

A. buckle                     B to buckle                  C buckling                   D for buckling 

6. .......... good ice cream , you need to use a lot of cream 

A Make                  B making                 C to make                        D for make 

7 , i got my friend ........... her car for the weekend 

A . to let me to borrow            B to let me borrow              C let me borrow                 D let me to borrow 

8 they .......... good friends , but they have fallen out recently

A . used to be                  B would be                 C were              D are

1 . It was so relaxing to be ....... old friends a , in               b, between           c , among                 d , around 2 . she ' s made friends .........a little girl who lives next door a , to        b , of             c , by                   d , with 3 . your friendship should be based on                   trust a , basic            b fragile                 c mutual                 d blind 4. the company expects................ from its employees a , constancy           b quality ...
Đọc tiếp

1 . It was so relaxing to be ....... old friends 

a , in               b, between           c , among                 d , around 

2 . she ' s made friends .........a little girl who lives next door 

a , to        b , of             c , by                   d , with 

3 . your friendship should be based on                   trust 

a , basic            b fragile                 c mutual                 d blind 

4. the company expects................ from its employees 

a , constancy           b quality               c interest                d loyalty 

5. i ' ve got lost of ............. , but only a few are really good friends 

a , close friends                 b , accquaintances               c , neighbors              d partners 

6 . friendship is a two - sided ......... , it lives by give - and - take 

a , affair                    b event              c aspect                   d feature 

7 . Unselfishness is the very essence of friendship 

a romantic part                b important part             c difficult part              d interesting part 

8 . they ........ a close friendship at university 

a created                 b became          c promoted                d formed 

9 We stayed friends even after we ............. and left home 

a brought up           b turned up              c grew up            d took up 

10 . He finds it ......... lasting friendships 

a difficult to make            b difficulty in making       c is difficult to make              d difficult making 

 

5
16 tháng 5 2019

1.A

2.D

3.C

4.D

5.A

6.C

16 tháng 5 2019

1.A

2.D

3.C

4.B

5.A

6.C

13 tháng 5 2019

Để có một chiếc loa bluetooth vừa chất vừa rẻ các bạn hãy cùng tìm hiểu qua cách làm loa bluetooth ngay sau đây nhé.

+ Bước 1: Các bạn cuốn dây đồng thành cuộn khoảng 50 vòng dây rỗng.

Cách chế loa nghe nhạc bluetooth không dây

Hàn 2 đầu dây chế mạch bluetooth

Các bạn lưu ý là đa số các dây đồng sợi thường được sơn phủ một lớp sơn cách điện nên các bạn cần phải cạo sạch lớp sơn này đi trước khi hàn nhé.

Trên jack cái 3.5mm có 3 đầu tất cả, trong đó 1 đầu trông khác hẳn là đầu GND các bạn hàn 1 dây vào đây, dây còn lại có thể hàn vào cả 2 đầu chờ còn lại (2 đầu này chính là cho loa trái và loa phải, nhưng muốn tách tín hiệu chúng ta cần 2 cuộn dây nên để đơn giản chúng ta hàn chung cho cả 2 loa phát giống nhau là được).

+ Bước 2: Đặt toàn bộ thiết bị vào 1 lớp vỏ bằng bìa hoặc nhựa mỏng, cho jack 3.5 mm ra ngoài để cắm loa vào.

Cho dây đồng vào gọn 1 khung

Một lưu ý là bạn phải khoét một lỗ ở mặt bất kỳ nơi đặt cuộn dây vì như vậy từ trường của loa mới truyền qua cuộn dây của thiết bị được. Thực hiện cách làm loa bluetooth từ trường có thể xuyên qua tấm nhựa và nó rất yếu nên chúng ta cần khoét để không tổn hao năng lượng của loa.

Tuy nhiên các bạn có thể dán một lớp băng dính mỏng lên lỗ vừa khoét để sản phẩm được đẹp mắt hơn. Với lớp băng dính mỏng này thì từ trường vẫn có thể xuyên qua được.

Và đây là thành quả sau khi hoàn thành, chỉ với ít phút làm theo hướng dẫn cách làm loa bluetooth trên các bạn đã có thể sở hữu một chiếc loa bluetooth chất lượng rồi. Để sử dụng thì các bạn hãy cắm dây 3.5mm vào thiết bị này, đầu còn lại cắm vào cổng Input của loa.

Để có một chiếc loa bluetooth vừa chất vừa rẻ các bạn hãy cùng tìm hiểu qua cách làm loa bluetooth ngay sau đây nhé.

+ Bước 1: Các bạn cuốn dây đồng thành cuộn khoảng 50 vòng dây rỗng.

Cách chế loa nghe nhạc bluetooth không dây

Hàn 2 đầu dây chế mạch bluetooth

Các bạn lưu ý là đa số các dây đồng sợi thường được sơn phủ một lớp sơn cách điện nên các bạn cần phải cạo sạch lớp sơn này đi trước khi hàn nhé.

Trên jack cái 3.5mm có 3 đầu tất cả, trong đó 1 đầu trông khác hẳn là đầu GND các bạn hàn 1 dây vào đây, dây còn lại có thể hàn vào cả 2 đầu chờ còn lại (2 đầu này chính là cho loa trái và loa phải, nhưng muốn tách tín hiệu chúng ta cần 2 cuộn dây nên để đơn giản chúng ta hàn chung cho cả 2 loa phát giống nhau là được).

+ Bước 2: Đặt toàn bộ thiết bị vào 1 lớp vỏ bằng bìa hoặc nhựa mỏng, cho jack 3.5 mm ra ngoài để cắm loa vào.

Cho dây đồng vào gọn 1 khung

Một lưu ý là bạn phải khoét một lỗ ở mặt bất kỳ nơi đặt cuộn dây vì như vậy từ trường của loa mới truyền qua cuộn dây của thiết bị được. Thực hiện cách làm loa bluetooth từ trường có thể xuyên qua tấm nhựa và nó rất yếu nên chúng ta cần khoét để không tổn hao năng lượng của loa.

Tuy nhiên các bạn có thể dán một lớp băng dính mỏng lên lỗ vừa khoét để sản phẩm được đẹp mắt hơn. Với lớp băng dính mỏng này thì từ trường vẫn có thể xuyên qua được.

Và đây là thành quả sau khi hoàn thành, chỉ với ít phút làm theo hướng dẫn cách làm loa bluetooth trên các bạn đã có thể sở hữu một chiếc loa bluetooth chất lượng rồi. Để sử dụng thì các bạn hãy cắm dây 3.5mm vào thiết bị này, đầu còn lại cắm vào cổng Input của loa.

6 tháng 5 2019

I. Nội qui tham gia "Giúp tôi giải toán"

1. Không đưa câu hỏi linh tinh lên diễn đàn, chỉ đưa các bài mà mình không giải được hoặc các câu hỏi hay lên diễn đàn;

2. Không trả lời linh tinh, không phù hợp với nội dung câu hỏi trên diễn đàn.

3. Không "Đúng" vào các câu trả lời linh tinh nhằm gian lận điểm hỏi đáp.

Các bạn vi phạm 3 điều trên sẽ bị giáo viên của Online Math trừ hết điểm hỏi đáp, có thể bị khóa tài khoản hoặc bị cấm vĩnh viễn không đăng nhập vào trang web.

6 tháng 5 2019

2k5 

cao tủi zữ

tk đi

1 . geothermal enery is produced from the heat stored in ..... earth ' s coreA. no article      B. the        C . an        D . a 2 . a lot of .... from several countries competed in many Asian Game A. spectators    B . viewers    C . athletes    D . audience 3. listener is a person ....... to the concert or music program A. listened        B to listen       C being listened      D listening 4 . It ' s necessary that all high building be equipped ..... smoke detector A. in                  B ....
Đọc tiếp

1 . geothermal enery is produced from the heat stored in ..... earth ' s core

A. no article      B. the        C . an        D . a 

2 . a lot of .... from several countries competed in many Asian Game 

A. spectators    B . viewers    C . athletes    D . audience 

3. listener is a person ....... to the concert or music program 

A. listened        B to listen       C being listened      D listening 

4 . It ' s necessary that all high building be equipped ..... smoke detector 

A. in                  B . with           C . by                   D . for 

5 .This is the bus ...... we'll go to school 

A. in that            B . on which         C . by which           D . from which

6.water power gives us enery ...........pollution 

A . without           B . of                  C . in                D . with 

7. In VN , many species have become .......... due to the irresponsible activities of people 

A. endangered       B . endanger         C . dangerous        D . danger 

8 . he is the youngest athlete ....... the prize in this field 

A . winning          B . won                 C . to win            D . to be won 

9. the Asian Games ............... place every 4 years

A. taking               B take                   C took                  D taken 

1
25 tháng 4 2019

1 . geothermal enery is produced from the heat stored in ..... earth ' s core

A. no arle      B. the        C . an        D . a 

2 . a lot of .... from several countries competed in many Asian Game 

A. spectators    B . viewers    C . athletes    D . audience 

3. listener is a person ....... to the concert or music program 

A. listened        B to listen       C being listened      D listening 

4 . It ' s necessary that all high building be equipped ..... smoke detector 

A. in                  B . with           C . by                   D . for 

5 .This is the bus ...... we'll go to school 

A. in that            B . on which         C . by which           D . from which

6.water power gives us enery ...........pollution 

A . without           B . of                  C . in                D . with 

7. In VN , many species have become .......... due to the irresponsible activities of people 

A. endangered       B . endanger         C . dangerous        D . danger 

8 . he is the youngest athlete ....... the prize in this field 

A . winning          B . won                 C . to win            D . to be won 

9. the Asian Games ............... place every 4 years

A. taking               B take                   C took                  D taken