单项选择题
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
Fixed CO2 systems would not be used on crew’s quarters ...
单项选择题Fixed CO2 systems would not be used on crew’s quarters or（）.
A.the paint locker B.spaces open to the atmosphere C.cargo holds D.the engine room
Firefighting foam is only effective when the foam（）.A.p...
单项选择题Firefighting foam is only effective when the foam（）.
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
