单选题Carbon dioxide as a fire fighting agent has which advantage over other agents?（）.AIt causes minimal damageBIt is safe for personnelCIt is cheaperDIt is most effective on a per unit basis
单选题
Carbon dioxide as a fire fighting agent has which advantage over other agents?（）.
A
It causes minimal damage
B
It is safe for personnel
C
It is cheaper
D
It is most effective on a per unit basis
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