Foam-type portable fire extinguishers are most useful in combating fires involving（）.
- Asolid materials such as wood or bales of fiber
- Bflammable liquids
- Celectrical equipment
- Dmetallic solid
问题
Foam-type portable fire extinguishers
参考解析：
分类：船员职务名称题库
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All portable fire extinguishers must be capable of being（）.Acarried by hand to a fireBcarried or rolled to a fireCrecharged in the fieldDused on class 'B' fire