单项选择题

Foam extinguishes a fire mainly by（）.

A.cooling
B.chemical action
C.smothering
D.inerting the air

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单项选择题

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

单项选择题

Flames from small leaks of LFG may be extinguished by（）.

A.utilizing carbon dioxide or dry chemical fire extinguishers
B.utilizing soda and acid fire extinguishers
C.blowing the flames out
D.letting it burn itself out