【单选题】【消耗次数：1】
合力对矩心的力矩等于所有分力对同一点力矩的（）
①
代数和
②
矢量和
③
乘积不确定
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[填空1] 定理是指平面汇交力系的合力对平面内任一点的矩，等于所有各分力对同一点的矩的代数和。
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