单项选择题
（）（解掉）the spring ！
A. Make fast B. Let go C. Hold on D. Pay out
单项选择题 （）(收紧) the slack on the stern line.
单项选择题 Before going to the forecastle, ask the engine room for（）（水电）on deck.
单项选择题 The anchor is（）(抓牢) ,four shackles in water.
