当平面力系可以合成为一个合力时，则其合力对于作用面内点之矩，等于力系中各分力对同一点之矩的和。
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作用在物体上诸力的作用线都分布在同一平面内，这种力系称为平面一般力系
A. 对
B. 错
主矢为原力系各力的代数和，对某点的主矩等于原力系中各力对该点之矩的代数和。
A. 对
B. 错
Compared with internal recruitment, the external recruitment has advantages:.
A. it helps bring "fresh blood" to the organization
B. it reaches a wider audience
C. it may avoid "political" of internal recruitment
Compared with external recruitment,what does internal recruitment have?
A. Internal recruitment requires a short training period.
B. Employees can be motivated by opportunities for advancement.
C. Internal recruitment is quicker and cheaper.
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