单项选择题

Removing which will extinguish a fire?（）.

A.Nitrogen
B.Carbon dioxide
C.Sodium
D.Oxygen

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单项选择题

Regular foam can be used on all but which flammable liquid?（）

A.Motor gasoline
B.Jet fuel
C.Crude petroleum
D.Alcohol

单项选择题

Recharging a previously used cartridge-operated dry-chemical extinguisher is accomplished by（）.

A.authorized fire equipment servicing personnel only
B.replacing the propellent cartridge and refilling with powder
C.puncturing the cartridge seal after installation
D.recharging the cartridge and refilling it with powder

单项选择题

Radiation spreads a fire by（）.

A.transferring heat across an unobstructed space
B.heated gases flowing through ventilation systems
C.burning liquids flowing into another space
D.transmitting the heat of a fire through the ship's metal