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?（）<br>A:one<br>B:two<br>C:three<br>D:four

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

出自：海船船员证

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