如图所示用一动�轮拉一物体a以05ms的速度 在水平面上作匀速直线运动物体a重为20n受到的� 擦阻力是物重的02倍水平拉力为2 Template




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tomski如图所示用一动�轮拉一物体a以05ms的速度 在水平面上作匀速直线运动物体a重为20n受到的� 擦阻力是物重的02倍水平拉力为2 coloring