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【单选题】
如图所示,分别沿力 F 1 、 F 2 、 F 3 、的方向用力,使杠杆平衡,关于三个力的大小,下列说法正确的是( )A.
沿F1方向的
B.
沿F2方向的
C.
沿F3方向的
D.
三个力的大小相等
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