单项选择题

An ABC dry chemical fire extinguisher would be LEAST effective against a fire in（）.

A.a mattress
B.spilled liquids such as oil or paint
C.high voltage electrical gear
D.a trash can

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单项选择题

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

单项选择题

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

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

单项选择题

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