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单选题
Doors refer to those removable units used for entrance or exit, and for enclosing other structure contained within the fuselage, including passenger and crew doors, cargo doors, emergence exits, etc. Electrical and hydraulic systems associated with door control are included as appropriate.
A
门指用于进、出以及用于封闭机身内包含的其他结构的可拆卸组件。包括乘客和机组舱门、货舱门、紧急出口等，以及如恰当，还包括电气和液压系统中与门控制相关的部件。
B
门包括可拆卸的用于连接进口和出口的单元，也用于阻断与机身相连。包括乘客和机组人员门、货舱门、紧急出口等，视具体情况考虑是否包括与门控制相关的电子和液压系统。
C
门包括可拆卸的单元用于连接进口和出口，也用于连接与机身相关的其他结构。包括乘客和机组人员门、货舱门、紧急出口等，视具体情况考虑是否包括与门控制相关的电力和液压系统。
答案解析
正确答案：A
相关知识点：
门的定义及相关系统选项A对
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