单项选择题
An inert gas system is designed to reduce the possibility of tank explosions by（）.
A.eliminating sparks and fire in the vicinity of cargo tanks
B.removing all hydrocarbon gases from the cargo tanks
C.blanketing cargo tanks with inert foam
D.reducing the oxygen concentration below levels necessary for combustion
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An important step in fighting any electrical fire is to（）.
A.stop ventilation
B.stop the vessel
C.de-energize the circuit
D.apply water to extinguish the fire -
单项选择题
An extinguishing agent which effectively cools，dilutes combustible vapors，removes oxygen，and provides a heat and smoke screen is（）.
A.carbon dioxide
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C.dry chemical
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单项选择题
An engine compartment gasoline fire requires which type of extinguisher?（）.
A.Carbon dioxide
B.Dry chemical
C.Foam
D.All of the above
