单项选择题
Decks, superstructure and hand rails may be washed with （）water at sea.
A.sea B.ballast C.fresh D.cement
单项选择题 The sailor keeping （）watch should clean the gangway, the rails, bulwark and the spaces around the gangway.
单项选择题 The sailor taking （）watch should do cleaning work on the bridge.
单项选择题 The sailors do cleaning and repair work under the supervision of the （）.
