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由n个物体组成的物体系,若它在平面任意力系作用下处于平衡,则能列写出几个个独立的平衡方程()。

单选题
2022-04-01 17:12
A、 1n个
B、 2n个
C、3n个
D、 4n个
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正确答案
C

试题解析

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