单项选择题
（）is used for heaving up and slacking away the anchor and chain.
A.A winch B.A windlass C.A deck crane D.A lifeboat engine
单项选择题 Frapping lines are fitted to lifeboat davits to（）.
单项选择题 If you hear more than six short blasts and one long blast of the whistle supplemented by the same signal on the general alarm，you should（）.
单项选择题 Line throwing equipment should not be operated（）.
