完全相同的直角三角形�块ab如图所示叠放设ab接触的斜面光�a与桌面的动�擦因数为现在b上施加一水平推力f恰好使ab保持相对静止 Template




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tomski完全相同的直角三角形�块ab如图所示叠放设ab接触的斜面光�a与桌面的动�擦因数为现在b上施加一水平推力f恰好使ab保持相对静止 coloring