如图所示水平地面上的物体a在斜�上的拉力f的作用下�右做匀速直线运动则关于下列物体受力情况的说法中正确的是 A.物体a可能只受到二个 Template




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tomski如图所示水平地面上的物体a在斜�上的拉力f的作用下�右做匀速直线运动则关于下列物体受力情况的说法中正确的是 a.物体a可能只受到二个 coloring