2.在水平地面上静止的物体它只受到一对平衡力的作用这对平衡力是 A.物体的重力和物体对地面的压力b.物体的重力和物体与地面间的�擦力c Template




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tomski2.在水平地面上静止的物体它只受到一对平衡力的作用这对平衡力是 a.物体的重力和物体对地面的压力b.物体的重力和物体与地面间的�擦力c coloring