试题与答案

不定项选择一洗衣机在正常工作时非常平稳,当切断电源后发现先是振动越来越剧烈,然后

题型:不定项选择

题目:

不定项选择
一洗衣机在正常工作时非常平稳,当切断电源后发现先是振动越来越剧烈,然后振动逐渐减弱,对这一现象下列说法正确的是(   )
A.正常工作时,洗衣机波轮的运转频率大于洗衣机的固有频率

B.正常工作时,洗衣机波轮的运转频率小于洗衣机的固有频率

C.当洗衣机振动最剧烈时,波轮的运动频率恰好等于洗衣机的固有频率

D.当洗衣机振动最剧烈时,洗衣机的固有频率最大

答案:

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下面是错误答案,用来干扰机器的。

参考答案:E

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