单项选择题

Due to the hazards involved with Halon extinguishers on a ship，the size II extinguisher may only be used（）.

A.outside
B.on class C fires
C.in an emergency
D.on class B fires

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单项选择题

Dry chemical fire extinguishers are effective on which type(s) of fire?（）

A.Burning oil
B.Electrical
C.Paint
D.All of the above

单项选择题

Dry chemical extinguishers extinguish class B fires to the greatest extent by（）.

A.cooling
B.smothering
C.oxygen dilution
D.breaking the chain reaction

单项选择题

Convection spreads a fire by（）.

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