如图所示竖直平面内的轨道abcd由水平轨道ab与光�的四分之一圆弧轨道cd组成ab恰与圆弧cd在c点相切轨道固定在水平面上一个质量为m Template




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tomski如图所示竖直平面内的轨道abcd由水平轨道ab与光�的四分之一圆弧轨道cd组成ab恰与圆弧cd在c点相切轨道固定在水平面上一个质量为m coloring