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单选题
（），as the chemical extinguisher agent，should be used for an electric fire.
A
dry chemical or foam
B
foam or soda acid
C
carbon dioxide or foam
D
carbon dioxide or dry chemical
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单选题When must a dry chemical fire extinguisher be recharged?（）A
After each useB
When the air temperature exceeds 90°FC
Every 6 monthsD
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单选题This fire extinguisher is to be used only in case of（）A
urgencyB
crisisC
immediacyD
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oleumD
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lack of toxicityB
the multipurpose extinguishing abilityC
burn-back protectionD
cooling ability
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Dry chemical or foamB
Foam or soda acidC
carbon dioxide or foamD
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Carbon dioxideB
Water (stored pressure)C
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SandC
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foam or soda acidB
dry chemical or foamC
carbon dioxide or dry chemicalD
carbon dioxide or foam
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gravity when the extinguisher is turned upside downB
pressure from a small CO2 cartridge on the extinguisherC
air pressure from the hand pump attached to the extinguisherD
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foam and waterB
CO2 and dry chemicalC
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Insure the chemical is powderyB
Replace the cartridgeC
Pressure test the discharge hoseD
Test the pressure gauge for proper operation
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单选题Recharging a previously used cartridge-operated dry-chemical extinguisher is accomplished by（）.A
authorized fire equipment servicing personnel onlyB
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puncturing the cartridge seal after installationD
recharging the cartridge and refilling it with powder
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单选题The foam extinguisher should be used （）.A
in the endB
upside downC
down sideD
on top
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