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单选题
The fire extinguishing action of CO2 comes mostly from （）.
A
breaking the fire chemical chain reaction
B
smothering
C
cooling
D
isolating the heat from the fuel
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opened and burned material removedB
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单选题CO2 extinguishes a fire by （）.A
a blanket of bubbles formed on the surface of the fireB
smotheringC
coolingD
isolating the heat from the fuel
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单选题Generally，the first action in extinguishing an LFG fire caused by escaping gas is to（）.A
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call the local fire department
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use all CO2 available to cool the surrounding areaB
stand by with water or other agentsC
thoroughly ventilate the space of CO2D
jettison all burning materials
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单选题After extinguishing a fire with C02,it is availabe to（）.A
use all CO2 available to cool the surronding areaB
stand by with water or other agentsC
thoroughly ventilate the space of CO2D
jettison all buring materials
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