单项选择题

What is the most important characteristic of the extinguishing agent in fighting a class C fire?（）

A.Weight
B.Temperature
C.Electrical nonconductivity
D.Cost

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单项选择题

What is required in addition to the heat，fuel，and oxygen of the fire triangle to have a fire?（）

A.Electricity
B.Chain reaction
C.Pressure
D.Smoke

单项选择题

What is NOT listed on the metallic name plate required to be attached to hand portable fire extinguishers?（）

A.The rated capacity in gallons，quarts，or pounds
B.The hydrostatic test date of the cylinder
C.The name of the item
D.An identifying mark of the actual manufacturer

单项选择题

What is NOT a characteristic of carbon dioxide fire-extinguishing agents?（）

A.Effective even if ventilation is not shut down
B.Will not deteriorate in storage
C.Non-corrosive
D.Effective on electrical equipment