单项选择题
Foam-type portable fire extinguishers are most useful 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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相关考题
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单项选择题
Foam is a very effective smothering agent and（）.
A.it provides cooling as a secondary effect
B.works well on extinguishing electrical fires
C.can be used to combat combustible metal fires
D.All of the above -
单项选择题
Foam extinguishes a fire mainly by（）.
A.cooling
B.chemical action
C.smothering
D.inerting the air -
单项选择题
Foam extinguishes a fire by（）.
A.smothering the burning material
B.chemical combination with burning material
C.absorbing the burning material
D.organic destruction of the burning material
