20.如图所示一个内壁光�的圆锥筒的轴线垂直于水平面圆锥筒固定不动有两个质量相同的小球a和小球b紧贴圆锥筒内壁分别在水平面内做匀速圆� Template




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tomski20.如图所示一个内壁光�的圆锥筒的轴线垂直于水平面圆锥筒固定不动有两个质量相同的小球a和小球b紧贴圆锥筒内壁分别在水平面内做匀速圆� coloring