如图所示在竖直平面内有一固定轨道其中ab是长为r的粗糙水平直轨道bcd是圆心为o半径为r的$frac{3}{4}$光�圆弧轨道两 Template




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tomski如图所示在竖直平面内有一固定轨道其中ab是长为r的粗糙水平直轨道bcd是圆心为o半径为r的$frac{3}{4}$光�圆弧轨道两 coloring