单选题Close all fire doors and use the （）（干粉灭火器）.Adry powder extinguisherBfoam extinguisherCCO2 extinguisherDportable extinguisher
单选题
Close all fire doors and use the （）（干粉灭火器）.
A
dry powder extinguisher
B
foam extinguisher
C
CO2 extinguisher
D
portable extinguisher
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