高中教育高考英语1995年全国高考英语试题
题目内容

Which of the following gives a general idea of how the noise-killing system works、

2024-07-14

A.By producing pressure waves going in the opposite direction.

B.By mixing high frequency sound waves with low frequency sound waves.

C.By making copies of the unwanted sound waves and letting them out a little later.

D.By mixing new sound waves with the noise and sending them out together.

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