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【多选题】
下列说法正确的是（）：A.
空间汇交力系的独立平衡方程数是 3 个。
B.
空间力偶系的独立平衡方程数是 1 个。
C.
空间任意力系一般可以简化为力螺旋。
D.
当空间力和力偶矩矢量平行时，空间任意力系简化的结果就是一个力螺旋。
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