使用1211灭火器，应喷向火的（）部位。
A、火的根部
B、火的上部
C、火的周围
参考答案：A
槽电压主要由阳极压降、阴极压降、（）、分解与极化压降、电解质压降以及（）分摊电压组成。
What are the most important reasons for using water fog to fight fires?（）
A.Smothers burning surfaces，organically destroys fuel
B.Cools fire and adjacent surfaces，provides protective barrier
C.Reaches areas not protected by steam or CO2 smothering systems
D.Allows fire to be attacked from leeward，saturates liquid surfaces
