All lifeboats，rescue boats，and rigid-type liferafts shall be stripped，cleaned，and thoroughly overhauled at least once every（）.<br>A:6 months<br>B:year<br>C:18 months<br>D:two years

All lifeboats，rescue boats，and rigid-type liferafts shall be stripped，cleaned，and thoroughly overhauled at least once every（）.
A:6 months
B:year
C:18 months
D:two years

出自：海船船员证

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