如图1所示水平地面上放物体a在a上又压了一个物体b则下列说法正确的是 A物体b只受重力和支持力且这两个力平衡 B物体a只受b的压力和 Template




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tomski如图1所示水平地面上放物体a在a上又压了一个物体b则下列说法正确的是 a物体b只受重力和支持力且这两个力平衡 b物体a只受b的压力和 coloring