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单选题
Each of the two life vests located at L2 entry door flight crew station expired.
A
A.Each of the two life vests located at L2 entry door flight crew station is damaged.
B
B.Each of the two life vests located at L2 entry door flight crew station is out of time limit.
C
C.Each of the two life vests located at L2 entry door flight crew station is out of service.
答案解析
正确答案：B
相关知识点：
L2舱门处两个救生衣过期
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