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单选题
Which of the fire extinguishing agents listed is the safest to use when combating a class C fire?（）
A
CO2
B
Foam
C
Water fog
D
Soda acid
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单选题For which of the listed classes of fire combinations would carbon dioxide be most suitable as the extinguishing agent （）.A
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SandC
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Dry chemical powderC
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WoodC
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Dry chemicalB
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CO2B
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单选题Fire extinguishing agents used on Class C fires must be（）.A
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water basedC
nonconductingD
nontoxic
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