單項(xiàng)選擇題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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1.單項(xiàng)選擇題After each reading of an oxygen indicator, the instrument should be purged with（）.
A.CO2
B.fresh air
C.the tested compartment's air
D.water
2.單項(xiàng)選擇題After extinguishing a fire with C02,it is availabe to（）.
A.use all CO2 available to cool the surronding area
B.stand by with water or other agents
C.thoroughly ventilate the space of CO2
D.jettison all buring materials
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According to the relevant regulation, lifeboat should be powered by（）.
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