单选题Each lifeboat must be lowered and maneuvered in the water at least once every（）.A2 monthsB3 monthsC4 monthsD5 months
单选题
Each lifeboat must be lowered and maneuvered in the water at least once every（）.
A
2 months
B
3 months
C
4 months
D
5 months
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