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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单项选择题

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

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

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