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【单选题】
若平面汇交力系中各任意两个互不平行的轴上投影的代数和为零,则此平面汇交力系一定处于
A.
平衡状态
B.
不平状态
C.
平面汇交力系的各力只有在一对正交轴上的投影的代数和为零时才处于平衡状态
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