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【单选题】
两个完全相同的圆盘，放在光滑水平面上，如图所示。在两个圆盘的不同位置上，分别作用两个相同的力F和F'。设两圆盘从静止开始运动。某瞬时两圆盘动量p A 和p B 的关系是______。A.
p A ＜p B
B.
p A ＞p B
C.
p A =p B
D.
不能确定
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