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【单选题】
图示系统仅在直杆 OA 与小车接触的 A 点处存在摩擦,在保持系统平衡的前提下,逐步增加拉力 F ,则在此过程中, A 处的法向约束力将 __ ____ 。
A.
越来越大
B.
越来越小
C.
保持不变
D.
不能确定
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