单选题All lifeboats，rescue boats，and rigid-type liferafts shall be stripped，cleaned，and thoroughly overhauled at least once every（）.A6 monthsByearC18 monthsDtwo years
单选题
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
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