单选题Foam-type portable fire extinguishers are more usefull in combating fires involving（）.Asolid materials such as wood or bales of fiberBinflammable liquidsCelectrical equipmentDmetallic solids
单选题
Foam-type portable fire extinguishers are more usefull in combating fires involving（）.
A
solid materials such as wood or bales of fiber
B
inflammable liquids
C
electrical equipment
D
metallic solids
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