单项选择题
Which extinguishing agent is best for use on a magnesium fire?（）
A.Water
B.Sand
C.CO2
D.Dry chemical
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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
