单项选择题
A.Opening the automatic drain plugs
B.Draining the water pockets
C.Using the electric bilge pump
D.Using the bailers and cellulose sponge
单项选择题 After jacking down your liftboat you have an unexpected list.You find that the only cause of this list must be a flooded leg.Your next course of action should be to（）.
单项选择题 After being rescued from the vessel accident，the people agreed that they had much to（）.
单项选择题 After being launched from a vessel，totally enclosed survival craft which have been afloat over a long period require（）.