19.如图所示竖直平面内的34圆弧形光�轨道半径为ra端与圆心o等高ad为水平面b点在o的正上方一个小球在a点正上方由静止释放 Template




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tomski19.如图所示竖直平面内的34圆弧形光�轨道半径为ra端与圆心o等高ad为水平面b点在o的正上方一个小球在a点正上方由静止释放 coloring