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【多选题】
下列哪不正确的。（）A.
力偶在轴上的投影恒为零。
B.
力偶的合力可以用一个代替。
C.
力偶可在其作用面内任意移动，但不能转动。
D.
只要两个力偶转向和作用平面相同，力偶矩大小相同，它们就是等效的。
E.
力偶系中所有各力偶矩的代数和等于零。
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