问题
单项选择题
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
答案
参考答案：D
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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
参考答案：D