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 safety shackle is identified by its（）.
单项选择题 A rope ladder with wooden rungs is a（）.
单项选择题 A new liferaft has been installed on your vessel. The operating cord should be（）.
