单选题Any extinguishing agent used on a Class “C” fire must have which important property? （）ACooling abilityBLeaves no residueCPenetrating powerDNonconductivity
单选题
Any extinguishing agent used on a Class “C” fire must have which important property? （）
A
Cooling ability
B
Leaves no residue
C
Penetrating power
D
Nonconductivity
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