如图所示竖直光�四分之三圆轨道bcd固定在水平面ab上轨道圆心为o半径r=1m轨道最低点与水平面相切于b点c为轨道最高点d点与圆心 Template




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tomski如图所示竖直光�四分之三圆轨道bcd固定在水平面ab上轨道圆心为o半径r=1m轨道最低点与水平面相切于b点c为轨道最高点d点与圆心 coloring