单选题

If you install the upper drag strut with the head down, it will hit the lower drag strut during retraction.

AA. 如果上部拉力杆安装时头部向上，那么下部阻力杆在收缩时就会碰撞上部拉力杆。

BB. 如果上部活塞杆收缩时头部向下，那么下部阻力杆安装时就会碰撞上部拉力杆。

CC. 如果上部阻力杆安装时头部向下，那么在收缩时就会碰撞下部阻力杆。

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正确答案：A （备注：此答案有误）

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