Which of the listed fire extinguishers is recommended for use on an electrical switchboard fire?（） A:CO2 B:ABC dry chemical C:CO2 propelled foam D:All of the above

Which of the listed fire extinguishers is recommended for use on an electrical switchboard fire?（）
A:CO₂
B:ABC dry chemical
C:CO₂propelled foam
D:All of the above

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