如图所示物体a在拉力作用下沿水平面匀速运动了一段距离s试比较拉力f1f2及拉力所做的功w1w2的大小�轮重绳重及绳与�轮之间的�擦 Template




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tomski如图所示物体a在拉力作用下沿水平面匀速运动了一段距离s试比较拉力f1f2及拉力所做的功w1w2的大小�轮重绳重及绳与�轮之间的�擦 coloring