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
单项选择题 An important step in fighting any electrical fire is to（）.
单项选择题 An extinguishing agent which effectively cools，dilutes combustible vapors，removes oxygen，and provides a heat and smoke screen is（）.
单项选择题 An engine compartment gasoline fire requires which type of extinguisher?（）.
