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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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单选题What is an advantage of using foam in fire fighting?（）A
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单选题After extinguishing a paint locker fire using the fixed CO2 system，the next action is to have the space（）.A
opened and burned material removedB
left closed with vents off until all boundaries are coolC
checked for oxygen contentD
doused with water to prevent reflash
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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
sweep flames away with water sprayB
shut off the leakC
use a chemical foam fire extinguisherD
call the local fire department
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单选题After extinguishing a fire with CO2，it is advisable to（）.A
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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