單項選擇題

How does foam extinguish an oil fire?（）.

A.By cooling the oil below the ignition temperature
B.By removing the fuel source from the fire
C.By excluding the oxygen from the fire
D.By increasing the weight of the oil

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單項選擇題

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

單項選擇題

High-velocity fog（）.

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

How does foam extinguish an oil fire?（）.

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

High-velocity fog（）.

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