单项选择题 A capsized small sail vessel is best righted when what part of the vessel is downwind?（）

单项选择题 A cable used by helicopters for lifting or lowering persons in a pick-up operation is a（）.

单项选择题 A breeches buoy is being rigged from the shore to a stranded vessel. The initial shot line passed to the vessel is normally made fast to a（）.