单选题:两人轻声谈话的声强级为40dB,热闹市场上噪声的声强级为80dB,市场上噪声:与轻声谈话的声强之比为(  )。

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题目内容:
两人轻声谈话的声强级为40dB,热闹市场上噪声的声强级为80dB,市场上噪声:与轻声谈话的声强之比为(  )。 A.2
B.20
C.102
D.104

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答案解析:

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