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单项选择题

According to the expert, people working in loud workplaces with anti-noise systems ...

a. are affected by the effects of noise.
b. can work more efficiently in ’zones of quiet’.
c. can hear conversations from another part of the room.

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热门试题

单项选择题The expert refers to one area of application which ...

a. cannot minimize the noise of aircraft engines and helicopter vibrations.
b. would be able to reduce noise in the cabin of an aircraft to more acceptable levels.
c. has resulted in new aircraft engines that are noisier than earlier ones.

单项选择题The expert describes a new technique using a microphone and a microprocessor which ...

a. responds to particular types of noise.
b. produces noise quieter than the car engine.
c. causes the car engine to run more quietly.