单选题By regulation，orange smoke distress signals will expire not more than how many months from the date of manufacture?（）A24 monthsB36 monthsC42 monthsD54 months
单选题
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
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