一质量为m的小物块在大小为f的水平恒力作用下贴着粗糙轨道从b处由静止往下�到a处克服�擦力做功为wfba两点间的高度差为h水平距离为 Template




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tomski一质量为m的小物块在大小为f的水平恒力作用下贴着粗糙轨道从b处由静止往下�到a处克服�擦力做功为wfba两点间的高度差为h水平距离为 coloring