矢量方程图解法依据的基本原理是理论力学中的运动合成原理。
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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
That is___ what I want you to do.
A. exactly
B. importantly
C. quickly
D. commonly
This product is said to be able to do__for women's skin.
A. best
B. wonders
C. usual
D. important
The ___you work,the__you will earn.
A. harder;less
B. hard;more
C. harder;more
D. hard;less
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