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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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Please wireless to let me know（）I am to anchor or to meet pilot.

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

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