更多"The practical use of radio waves br"的相关试题:
[单项选择]The practical use of radio waves brought about______.
A. new machines for planes
B. a radio directing and ranging device
C. new radio sets for RAF bombers
D. a discovering device
[单项选择]If the radio waves had reached our planet one hundred years before, we would have______.
A. sent an immediate answer
B. sent an alarm against extraterrestrial attack
C. sent a short reply
D. sent no answer
[单项选择]The British used radio waves because they ____________.
A. were more exact than sound waves
B. could not be detected
C. could penetrate fog and clouds
D. were easier to use than sound waves
[单项选择]Radio signals are waves that are used to _________ music or speech.
A. transfer
B. transmit
C. transport
D. transform
[单项选择]To produce artificial noses for practical use, it is essential______.
A. to develop microchips with thousands of odor receptors
B. to invent chips sensitive to various chemicals
C. to design a computer program to sort out smells
D. to find chemicals that can alter the electrical current passing through
[单项选择]What important discovery about seismic waves does the instructor mention
[单项选择]Mostocean waves are generatedby wind current that agitate the water's surface.
[单项选择]Initial reports were that multiple waves of warplanes bombed central Baghdad, hitting oil refineries and the airport.
A. beating
B. knocking
C. hurting
D. striking
[单项选择]Seismic waves generated by an earthquake or large explosion can be recorded thousands of kilometer from their source.
[单项选择]Ocean waves can cut imposing cliffs along coastlines.（）
A. immobile
B. impermeable
C. impressive
D. imaginative
[单项选择]Cox Radio, one of the nation's largest radio chains, plans to ______ its ties with independent record promoters to distance itself from a payola-like practice that runs rampant in the music business.
A. consolidate
B. tout
C. sever
D. splash
