Each lifeboat must be lowered and maneuvered in the water at least once every（）.<br>A:2 months<br>B:3 months<br>C:4 months<br>D:5 months

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

出自：海船船员证

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