單項(xiàng)選擇題
A.solid materials such as wood or bales of fiber B.inflammable liquids C.electrical equipment D.metallic solids
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
A.cooling B.chemical action C.smothering D.inerting the air
A.smothering the burning material B.chemical combination with burning material C.absorbing the burning material D.organic destruction of the burning material
A.shutting off the air supply B.cooling the fuel to below ignition temperature C.dispersing the fuel D.removing the source of ignition
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
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
A.the paint locker B.spaces open to the atmosphere C.cargo holds D.the engine room
A.penetrates to the bottom of the fire B.is kept saturated with low-velocity water fog C.mixes with the burning fuel oil D.completely covers the top of the burning liquid
A.Conduction of heat to adjacent surfaces B.Direct radiation C.Convection D.All of the above
A.closing the compartment except for the ventilators B.completely closing the compartment C.leaving the compartment open to the air D.increasing the air flow to the compartment by blowers
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