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【多选题】
下列描述正确的有（）A.
几何法是用力多边形法则求合力的方法
B.
平面汇交力系平衡的充要条件是合力等于零
C.
合力在任意轴上的投影等于各个分力在同一轴上投影的代数和
D.
合力与y轴所夹锐角为tanα=|Ry/Rx|
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