单项选择题
A sea anchor is（）.
A.a heavy anchor with an extra long line used to anchor in deep water B.a cone shaped bag used to slow down the wind drift effect C.a padeye to which the sea painter is made fast D.made of wood if it is of an approved type
单项选择题 A person referring to the stern sheets of a lifeboat is speaking of（）.
单项选择题 （）is used for heaving up and slacking away the anchor and chain.
单项选择题 Frapping lines are fitted to lifeboat davits to（）.
