單項選擇題

All portable fire extinguishers must be capable of being（）.

A.carried by hand to a fire
B.carried or rolled to a fire
C.recharged in the field
D.used on class 'B' fires

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單項選擇題

All of the following are part of the fire triangle EXCEPT（）.

A.electricity
B.fuel
C.oxygen
D.heat

單項選擇題

After extinguishing a paint locker fire using the fixed CO₂ system，the next action is to have the space（）.

A.opened and burned material removed
B.left closed with vents off until all boundaries are cool
C.checked for oxygen content
D.doused with water to prevent reflash