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【单选题】
以下工程实例中，属于稳定性问题的是（）
A.
空气压缩机的活塞杆工作中，在载荷反复作用下折断
B.
起重钢索被重物拉断
C.
因齿轮轴变形过大而使轴上的齿轮啮合不良
D.
千斤顶螺杆因压力过大而变弯
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