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单选题
该系统中的这一部分能够使飞机在地面上滑行和制动，并在起落架收上后使机轮停止转动，具体包括旋转轴密封装置、防滑装置、压力指示器、管道等。
A
That portion of the system provides for rolling and stopping the aircraft while on the ground and stopping wheel rotation after retraction, including items such as swivel glands, anti-skid devices, pressure indicators, plumbing, etc.
B
That portion of the system provides for rolling and stopping the aircraft while on the ground and stopping wheel rotation after retraction, including items such as wing illumination, warning light dimming systems, pressure indicators, plumbing, etc.
C
That portion of the system provides for rolling and stopping the aircraft while on the ground and stopping wheel rotation before retraction, including items such as supply valves, anti-skid devices, pressure warning systems, plumbing, etc.
答案解析
正确答案：A
相关知识点：
起落架相关装置要掌握
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