单项选择题
An advantage of a dry chemical over a carbon dioxide fire extinguisher is its（）.
A.greater range
B.effectiveness on all types of fires
C.cleanliness
D.All of the above
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相关考题
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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 -
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
