室内洗衣机工作时,测得噪声声压 p = 0.02Pa ;电冰箱单独开动时声压级是...

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室内洗衣机工作时,测得噪声声压 p = 0.02Pa ;电冰箱单独开动时声压级是 54dB ,试计算两者同时开动时的合成声压级。

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