单项选择题
After launching，an inflatable raft should be kept dry inside by（）.
A.Opening the automatic drain plugs
B.Draining the water pockets
C.Using the electric bilge pump
D.Using the bailers and cellulose sponge
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After being launched from a vessel，totally enclosed survival craft which have been afloat over a long period require（）.
A.frequent opening of hatches to permit entry of fresh air
B.regular checks of bilge levels
C.use of ear plugs to dampen engine noise
D.frequent flushing of the water spray system with fresh water
