16.如图3所示ab是一段半径为r的圆绵弧曲面在光�水平面上一小球以某一速度运动到a点最后落在水平地面上的c点已知小球没有跟圆弧曲面的 Template




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tomski16.如图3所示ab是一段半径为r的圆绵弧曲面在光�水平面上一小球以某一速度运动到a点最后落在水平地面上的c点已知小球没有跟圆弧曲面的 coloring