1/who invented telegraph, telephone, facebook,internet,newreed,television?
when was ỉt invented telegraph, telephone, facebook,internet,newreed,television?
where was ỉt invented telegraph, telephone, facebook,internet,newreed,television?
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H
24 tháng 2 2020
26. What is the best title for the passage?
A. Thomas Edison’s many inventions
B. Improvements in telephone and telegraph
C. The History of Menlo Park
D. An accidental invention
27. In what year did the invention of phnograph occur?
A. 1876 B. 1877 C. 1878 D. the article does not say
28. What was Edison working on when he created the phonograph?
A. A telegraph repeater B. A telegraph diaphragm
C. A telephone repeater D. A telephone diaphragm
29. According to the passage, how was the phonograph made?
A. With a telephone needle and a recorder
B. From a recording of a telegraph
C. With only a telegraph repeater
D. From a combination of telephone & telegraph part
30. According to the passage, how did Edison test his new invention?
A. He made improvements to the machine.
B. He used a carbon transmitter.
C. He read a children’s rhyme.
D. He produced the audience voice.
S
_silverlining
CTVVIP
6 tháng 5 2018
The invention of the phonograph happened quite by accident. Thomas Edison moved to Menlo Park, New Jersy in 1876, where he established an industrial research laboratory. There, Edison was working on a carbon telephone transmitter to improve the existing Bell telephone system.
In that laboratory a year later, Edison invented the phonograph while he was trying to
improve a telegraph repeater. He attached a telephone diaphragm to the needle in the telegraph
repeater; in this way, he was able to reproduce a recording that could be played back. After he made some improvements to the machine, he tested it. He recited “Mary Had a Little Lamb” into the machine and played his voice back to a very surprised audience.
a)Was the phonograph an accidental invention
Yes, it was.
ỉt là gì?
là 'it' viết nhầm ạ!!