如图所示有一内壁光�的闭合椭圆形管道置于竖直平面内mn是通过椭圆中心o点的水平线已知一小球从m点出�初速率为v0沿管道mpn运动 Template




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tomski如图所示有一内壁光�的闭合椭圆形管道置于竖直平面内mn是通过椭圆中心o点的水平线已知一小球从m点出�初速率为v0沿管道mpn运动 coloring