题目内容

作简谐运动的物体,相位确定了,那么振动状态也就确定了。

A. 对
B. 错

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A. He'sgotaheadache.
B. Hecan'tsleepatnight.
C. Hecoughsalot.
D. Hedoesn'tfeellikeeating.

2.

A. Havesomefood.
B. Cleanthetable.
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D. Buyadictionary.

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A. Thesalesmanager.
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4.

A. Teacherandstudent.
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D. Husbandandwife.

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