两物体a和b通过跨过定�轮的细绳连接它们都处于静止状态对于物体a的受力下列说法正确的是 A.受重力绳子拉力�擦力作用b.受重力 Template




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tomski两物体a和b通过跨过定�轮的细绳连接它们都处于静止状态对于物体a的受力下列说法正确的是 a.受重力绳子拉力�擦力作用b.受重力 coloring