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单选题
Never extinguish oil and electrical fires with （）.
A
water
B
foam extinguisher
C
CO2 extinguisher
D
portable extinguisher
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whichB
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waterB
foam extinguisherC
CO2 extinguisherD
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stop ventilationB
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单选题To extinguish an electrical fire, you should use （）.A
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单选题Which statement about firefighting foam is TRUE?（）A
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单选题Which extinguishing agent is the best for use on electrical fires?（）A
FoamB
CO2C
Dry chemicalD
Water fog
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conducts electricityB
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单选题An ABC dry chemical fire extinguisher would be LEAST effective against a fire in（）.A
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