After being launched from a vessel, totally enclosed survival craft which have been afloat over a long period require（）.<br>A:frequent opening of hatches to permit entry of fresh air<br>B:regular checks of bilge levels<br>C:use of ear plugs to dampen engine noise<br>D:frequent flushing of the water spray system with fresh water

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

出自：海船船员证

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