单选题A vessel in ocean service that does not have an approved means of processing oily bilge slops or oily ballast must have（）.Aa fixed piping system for ballast discharge to a reception facilityBa discharge outlet for the ballast system on each side of the weather deckCone portable adapter for a shore connection to the ballast lineDAll of the above
单选题
A vessel in ocean service that does not have an approved means of processing oily bilge slops or oily ballast must have（）.
A
a fixed piping system for ballast discharge to a reception facility
B
a discharge outlet for the ballast system on each side of the weather deck
C
one portable adapter for a shore connection to the ballast line
D
All of the above
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