单项选择题
After abandoning ship, you should deploy the sea anchor from a life raft to（）.
A.keep the life raft from capsizing B.navigate against the current C.keep personnel from getting seasick D.stay in the general location
单项选择题 After being launched from a vessel, totally enclosed survival craft which have been afloat over a long period require（）.
单项选择题 After each reading of an oxygen indicator, the instrument should be purged with（）.
单项选择题 After extinguishing a fire with C02,it is availabe to（）.
