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After being launched from a vessel,totally enclosed survival craft which have been afloat over a long period require().

单选题
2022-01-01 05:45
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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正确答案
B

试题解析

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