物体P静止于固定的斜面上,P的上表面水平,现把物体Q轻轻地叠放在P上,则 A.P向下滑物体P静止于固定的斜面上,P的上表面水平,现把物体Q轻轻地叠放在P上,则 A.P向下滑动B.P静止不动C.P所受的合外
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