单选题The disadvantage of using CO2 is that the（）.ACO2 does not cool the fireBcylinders are regulated pressure vesselsCC02 is not effective on class B firesDC02 is not effective on class C fires
单选题
The disadvantage of using CO2 is that the（）.
A
CO2 does not cool the fire
B
cylinders are regulated pressure vessels
C
C02 is not effective on class B fires
D
C02 is not effective on class C fires
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