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Gas masks ______.
A.should be worn while fighting a fire
B.can be used in atmospheres deficient in oxygen
C.filter contaminants from air that is to be breathed
D.may be substituted for a self-contained breathing apparatus
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单选题Gas masks（）.A
should be worn while fighting a fireB
can be used in atmosphere deficient in oxygenC
filter contaminants from air that is to be breathedD
may be substituted for a self-contained breathing apparatus
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单选题The fresh air intake of the inert gas system（）.A
prevents the flue gas from falling below 3% content of oxygenB
allows the inert gas piping to be used for gas freeing the tanksC
opens when there is excessive vacuum on the deck water sealD
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255.255.0.0B
255.255.248.0C
255.255.255.0D
255.255.255.255
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can be used in atmospheres deficient in oxygenC
filter contaminants from air that is to be breathedD
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单选题Each ship having an inert gas system must have a portable instruments to measure concentrations of hydrocarbon vapor in inert atmospheres and also to measure（）.A
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单选题An inert gas system on a tanker should be used to（）.A
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prevent fires in the pumproom by continually displacing flammable vapors
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