题目内容

机构的速度多边形就是机构不同方向受力使之有不同方向的速度从而有不同方向的速度。

A. 对
B. 错

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That is___ what I want you to do.

A. exactly
B. importantly
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D. commonly

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A. best
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C. usual
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A. harder;less
B. hard;more
C. harder;more
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A. especial
B. unusual
C. usual
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