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

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单项选择题

A.Water
B.Sand
C.CO₂
D.Dry chemical

单项选择题

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

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