单选题The bilge pump on a fishing vessel（）.Amust be fixed if the vessel exceeds 12 meters in lengthBmay be used as a fire pumpCmust be portable if there are more than 4 watertight compartmentsDmust be capable of pumping at least 450 gpm
单选题
The bilge pump on a fishing vessel（）.
A
must be fixed if the vessel exceeds 12 meters in length
B
may be used as a fire pump
C
must be portable if there are more than 4 watertight compartments
D
must be capable of pumping at least 450 gpm
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