单项选择题
A bilge suction line，in a fishing vessel with more than 16 individuals aboard，must have a strainer with an open area not less than how many times the open area of the suction line?（）
A.one
B.two
C.three
D.four
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单项选择题
Limber is a term associated with（）.
A.emergency gear
B.drainage
C.deck cargo storage
D.securing gear
