图4 5 1.如图4 5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两个质量相同的小球a和b紧贴着内壁分别在图中所示的水平面 Template




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tomski图4 5 1.如图4 coloring