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單項選擇題

Which extinguishing agent is best for use on a magnesium fire?（）

A.Water
B.Sand
C.CO₂
D.Dry chemical

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單項選擇題

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

單項選擇題

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

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