单选题After being launched from a vessel，totally enclosed survival craft which have been afloat over a long period require（）.Afrequent opening of hatches to permit entry of fresh airBregular checks of bilge levelsCuse of ear plugs to dampen engine noiseDfrequent flushing of the water spray system with fresh water
单选题
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
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