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

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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

单项选择题

Foam extinguishes a fire by（）.

A.shutting off the air supply
B.cooling the fuel to below ignition temperature
C.dispersing the fuel
D.removing the source of ignition