单项选择题
A.activating the release lock of the hook
B.pulling smartly on the knobbed cocking lanyard
C.the effects of buoyancy removing the weight of the raft from the hook
D.releasing the boarding flap and the bowsing lines
单项选择题 What is an advantage of having wire rope with a fiber core over that of a wire rope of the same size with a wire core（）.
单项选择题 What equipment is customarily used when seamen are working on a stage rigged over the side of a vessel（）.
单项选择题 What does the term end-for-end refer to in regard to a wire towing hawser（）.