單項選擇題Please supply us with 250 tons of fresh water. You are requested to deliver it on board().

A.till Friday
B.on Friday at the latest
C.until Friday afterwards
D.at Friday soonest


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A.which
B.where
C.what
D.who

2.單項選擇題Pump out No.2 port ballast tank to().

A.keep vessel afloating
B.refloat vessel listing to port
C.make vessel all-right
D.bring vessel upright