由光�细管组成的轨道如图所示其中ab段和bc段是半径为r的四分之一圆弧轨道固定在竖直平面内.一质量为m的小球从距离水平地面为h的管口d处 Template




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tomski由光�细管组成的轨道如图所示其中ab段和bc段是半径为r的四分之一圆弧轨道固定在竖直平面内.一质量为m的小球从距离水平地面为h的管口d处 coloring