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单选题
The exit doors used to facilitate evacuation that are not normally used for exit.
A
The exit doors are mainly used for passenger boarding.
B
The exit doors are only used for evacuation.
C
The exit doors are not only used for the passengers to evacuate from the airplane but also used for normal exit.
答案解析
正确答案：B
相关知识点：
应急门仅用于疏散
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