When launching a lifeboat in the rough sea
题型：单项选择题
问题：
When launching a lifeboat in the rough sea，the davit gears should be released（）.
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