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電機(jī)的振動(dòng)問(wèn)題,,請(qǐng)教 |
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點(diǎn)評(píng)
每分鐘4轉(zhuǎn)的速度不可能產(chǎn)生振動(dòng),。震源是由電機(jī)傳來(lái)的。
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