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
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A rope ladder with wooden rungs is a（）.
A.drop ladder
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A new liferaft has been installed on your vessel. The operating cord should be（）.
A.attached to the raft stowage cradle or to a secure object nearby with a weak link
B.checked to see that it's unattached
C.coiled neatly on the raft container
D.faked on deck and lead through a chock
