20.如图所示两个等大的水平力f分别作用在物体bc上物体abc都处于静止状态.各接触面与水平地面平行物体ac间的�擦力大小为f1 Template




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tomski20.如图所示两个等大的水平力f分别作用在物体bc上物体abc都处于静止状态.各接触面与水平地面平行物体ac间的�擦力大小为f1 coloring