单项选择题
After leaving the port, we used （）to clean the empty holds and decks.
A. fresh water B. sea water C. both A and B D. ballast water
单项选择题 Everything on the bridge should （）clean and tidy.
单项选择题 Decks, superstructure and hand rails may be washed with （）water at sea.
单项选择题 The sailor keeping （）watch should clean the gangway, the rails, bulwark and the spaces around the gangway.
