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


您可能感興趣的試卷

你可能感興趣的試題

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

3.單項(xiàng)選擇題After putting on a self-contained breathing apparatus, you open the air supply and hear a continuous ringing of a bell.What does this mean?（）.

A.The unit is working properly
B.The face mask is not sealed properly
C.The air bottle needs to be refilled
D.The air supply hose has a leak

4.單項(xiàng)選擇題After using a C02 portable extinguisher,it should be（）.

A.put back in service if some CO2 remains
B.hydrostatically tested
C.retagged
D.recharged

5.單項(xiàng)選擇題All dunnage planks and mats must be sent to board（）commencement of loading.

A.prior to
B.during
C.in the period of
D.afterwards