单选题Pump out No.2 port ballast tank to（）.Akeep vessel afloatingBrefloat vessel listing to starboardCmake vessel all-rightDbring vessel upright
单选题
Pump out No.2 port ballast tank to（）.
A
keep vessel afloating
B
refloat vessel listing to starboard
C
make vessel all-right
D
bring vessel upright
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