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
Foam extinguishes a fire by（）.A.shutting off the air su...
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
Flames from small leaks of LFG may be extinguished by（）...
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
Flame screens are used to（）.A.contain flammable fumesB....
单项选择题Flame screens are used to（）.
A.contain flammable fumes B.protect firefighters from flames C.prevent flames from entering tanks D.keep flames and sparks from getting out of an engine's exhaust system
