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如图所示,竖直放置的光滑圆弧型轨道O为圆心,且AB为沿水平方向的直径,圆弧的最低点为D.若在A点以初速度v沿AB方向平抛一小球a,同时在圆弧底部C处释放小球b(CD之间的弧长远小于圆弧半径),则小球b第一次向A运动过程中( ) A.两个小球在D相遇 B.两个小球不可能相遇 C.若适当调整一小球a的平抛初速度,两个小球可能在D的右侧圆弧上相遇 D.若适当调整一小球a的平抛初速度,两个小球可能在D的左侧圆弧上相遇
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