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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相关考题
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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
