单项选择题
A.stop ventilation B.stop the vessel C.de-energize the circuit D.apply water to extinguish the fire
An extinguishing agent which effectively cools，dilutes ...
单项选择题An extinguishing agent which effectively cools，dilutes combustible vapors，removes oxygen，and provides a heat and smoke screen is（）.
A.carbon dioxide B.Halon 1301 C.dry chemical D.water fog
An engine compartment gasoline fire requires which type...
单项选择题An engine compartment gasoline fire requires which type of extinguisher?（）.
A.Carbon dioxide B.Dry chemical C.Foam D.All of the above
An effective method for moving patients with spinal inj...
单项选择题An effective method for moving patients with spinal injuries onto a spine board is known as the（）.
A.pack-strap carry B.two man extremities carry C.fireman's drag D.four man log roll
