单项选择题
A.before the boat is lowered from the stowed position
B.as the boat-fall blocks break clear of the davit head
C.before the boat is lowered from the embarkation level
D.after the boat is released into the water
单项选择题 When landing a lifeboat through heavy surf with a strong current running parallel to the beach (from right to left when facing from seaward) the recommended procedure is to（）.
单项选择题 When a man who has fallen overboard is being picked up by a lifeboat，the boat should approach with the wind（）.
单项选择题 What should be used to steer an open lifeboat if the rudder becomes lost or damaged?（）