如图1,是在城市道路旁常见的警示牌。它是从哪个途径减小噪声的(

如图1,是在城市道路旁常见的警示牌。它是从哪个途径减小噪声的(    )
A.声源处;B.传播中;C.接收处;D.都有可能

答案

A解析:

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