单项选择题
Which extinguishing agent is most effective on a mattress fire?（）
A.CO2
B.Foam
C.Dry Chemical
D.Water
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相关考题
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单项选择题
Which extinguishing agent is effective in combating an isoprene fire?（）
A.Dry chemicals
B.CO2
C.Foam
D.All the above -
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 -
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
