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单选题
That portion of the system which is used to extend and retract the landing gear and open and close the landing gear doors. Includes items such as actuating mechanisms, bogie trim, bungees, up and down latches, operating controls, valves and motors, cables, plumbing, etc.
A
系统中用于放出和收上起落架、打开和关闭起落架门的部分，包括作动机构、轮架配平装置、弹簧筒、上下门闩、操作控制装置、活门和马达、钢索、管道等。
B
系统中用于延伸和缩回起落架并打开和关闭起落架门的那部分。包括刹车、车轮、浮子、上下门闩、操作控制装置、阀门和电机、电缆、管道等。
C
系统中用于延伸和缩回起落架并打开和关闭起落架门的那部分。包括旋转密封套、防滑装置、压力指示器、上下门闩、操作控制装置、阀门和电机、电缆、管道等。
答案解析
正确答案：A
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