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單項(xiàng)選擇題

Which characteristic of Halon is a disadvantage when it is used as a fire extinguishing medium?（）

A.Leaves a residue
B.Cost，relative to other agents
C.Breaks down while under prolonged storage
D.Conducts electricity

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單項(xiàng)選擇題

Which characteristic is an advantage of Halon as a fire extinguishing medium?（）

A.Electrically non-conductive
B.Relatively inexpensive
C.Effective against chemicals containing an oxidizer
D.All of the above

單項(xiàng)選擇題

Which action is routinely performed at the annual servicing and inspection of a dry-chemical cartridge-operated portable fire extinguisher?（）

A.Insure the chemical is powdery
B.Replace the cartridge
C.Pressure test the discharge hose
D.Test the pressure gauge for proper operation

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