问题
单项选择题
By regulation，orange smoke distress signals will expire not more than how many months from the date of manufacture?（）
A.24 months
B.36 months
C.42 months
D.54 months
答案
参考答案：C
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By regulation，orange smoke distress signals will expire not more than how many months from the date of manufacture?（）
A.24 months
B.36 months
C.42 months
D.54 months
参考答案：C