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CO2 extinguishes a fire by __________.
A.a blanket of bubbles formed on the surface of the fire
B.smothering
C.isolating the heat from the fuel
D.cooling
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单选题What is meant by the term overhaul in firefighting?（）A
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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
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Use the fire main system and evacuate the engine roomC
Evacuate the engine room and use the CO2 systemD
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