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单选题
An advantage of an ABC dry chemical over a carbon dioxide extinguisher is（）.
A
lack of toxicity
B
the multipurpose extinguishing ability
C
burn-back protection
D
cooling ability
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单选题As compared to carbon dioxide，dry chemical has which advantage?（）.A
CleanerB
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单选题Flames from small leaks of LFG may be extinguished by（）.A
utilizing carbon dioxide or dry chemical fire extinguishersB
utilizing soda and acid fire extinguishersC
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单选题（）as the chemical extinguisher agent, should be used for a an electric fire.A
Dry chemical or foamB
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carbon dioxide or foamD
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单选题An advantage of a dry chemical over a carbon dioxide fire extinguish is its（）.A
greater rangeB
effective on all types of firesC
cleanlinessD
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foam or soda acidB
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单选题As compared to carbon dioxide,dry chemical has which advantage?（）.A
CleanerB
EffectiveC
Greater rangeD
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判断题Natural systems can reduce the amount of carbon dioxide in the atmosphere caused by carbon emissions.A
对B
错
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accumulation of carbon dioxide gas that chokes the batteryB
accumulation of explosive and toxic gases the battery can generateC
mildew or dry rot in the battery boxD
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单选题Why should you wear a self-contained breathing apparatus before entering the engine room after the fixed CO2 system has been discharged to combat a major fire?（）A
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in all battery storage locationsC
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