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单选题
One disadvantage of using regular dry chemical (sodium bicarbonate) in firefighting is that（）.
A
it can break down under high heat and emit noxious fumes
B
it will decompose under prolonged storage and lose its effectiveness
C
fire has been known to flash back over the surface of an oil fire
D
it is ineffective in fighting fires in high-voltage electrical equipment
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更多 “单选题One disadvantage of using regular dry chemical (sodium bicarbonate) in firefighting is that（）.A it can break down under high heat and emit noxious fumesB it will decompose under prolonged storage and lose its effectivenessC fire has been known to flash back over the surface of an oil fireD it is ineffective in fighting fires in high-voltage electrical equipment” 相关考题
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考题
单选题Which action is routinely performed at the annual servicing and inspection of a dry-chemical cartridge-operated portable fire extinguisher?（）A
Test the pressure gauge for correct readingB
Weigh the cartridgeC
Replace the dry chemicalD
Pressure test the discharge hose
考题
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As compared to carbon dioxide，dry chemical has which advantage?（）.A
CleanerB
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blowing the flames outD
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greater rangeB
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单选题A portable dry chemical fire extinguisher discharges by（）.A
gravity when the extinguisher is turned upside downB
pressure from a small CO2 cartridge on the extinguisherC
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pressure from the reaction when water is mixed with the chemical
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考题
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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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