单项选择题

How do you operate a portable CO₂ fire extinguisher?（）.

A.Point the horn down
B.Turn cylinder upside-down
C.Break the rupture disc
D.Pull pin，squeeze grip

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单项选择题

A.is a finer，more diffuse water spray than low-velocity fog
B.requires that the water pressure be no greater than 60 psi
C.produces an effective fog pattern no more than 6 feet beyond the nozzle
D.extinguishes a fire by absorbing heat and reducing the supply of oxygen

单项选择题

Halon from extinguishers used on a class B fire，should be directed（）.

A.at the top of the flames
B.at the base of the fire near the edge
C.in short quick bursts
D.toward the upwind side of the fire

单项选择题

Halon fire extinguishers are NOT effective when used on which types of fires?（）

A.Fires in electrical equipment
B.Flammable oils and greases
C.Class A fires in ordinary combustibles
D.Materials containing their own oxygen

How do you operate a portable CO2 fire extinguisher?（）.

相关考题

How do you operate a portable CO₂ fire extinguisher?（）.