题目内容

三力平衡定理是

A. 刚体受不共面三个力作用时也可能平衡。
B. 三力汇交于一点，则这三个力必互相平衡
C. 共面不平行的三个力互相平衡必汇交于一点。
D. 共面三力若平衡，必汇交于一点

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