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.

<上一题目录下一题>

热门试题

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.

单项选择题The expert claims that the new systems can ...

a. deal with repetitive noise.
b. eliminate noise completely.
c. deal with one-off noise.