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单选题
Those units and components which furnish a means of supporting and steering the aircraft on the ground or water, and make it possible to retract and store the landing gear in flight. Includes brakes, wheels, floats, doors, shock struts, tires, linkages, position indicating and warning systems.
A
那些能在地面或水上操控飞机，并能在飞行中伸出起落架的装置和部件。包括刹车，车轮，浮子，门，减震支柱，轮胎，连杆，位置指示和警告系统。
B
那些能在地面或水上支撑和控制飞机行驶方向，并能在飞行中收回和储存起落架的装置和部件，包括刹车、机轮、浮筒、门、减震支柱、轮胎、连杆、位置指示和告警系统。
C
在地面或水中提供支持和操纵飞机的装置和部件，并使主齿轮在飞行中收起和存放的装置和部件。包括刹车，车轮，浮子，门，减震支柱，轮胎，连杆，位置指示和警告系统。
答案解析
正确答案：B
相关知识点：
起落架相关装置及系统
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