单项选择题
A tug is approaching a broken down steamer in moderately heavy weather preparing to take it in tow. In most cases the（）.
A.steamer will drift stern downwind B.tug will drift faster than the steamer C.tug should approach stern to D.tug should approach from downwind
单项选择题 A tourniquet should be used to control bleeding ONLY（）.
单项选择题 A survival craft being used to pick up a person who has fallen overboard from a vessel should approach the person（）.
单项选择题 A snag or other underwater obstruction may form a（）.
