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单选题
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
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单选题If a CO2 fire extinguisher is not readily available, which of the listed fire extinguishers would be best suited to combat a small electrical fire in a switchboard?（）A
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单选题Halon from extinguishers used on a class B fire，should be directed（）.A
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ElectricalC
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