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
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