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单选题
Never extinguish oil and electrical fires with （）.
A
water
B
foam extinguisher
C
CO2 extinguisher
D
portable extinguisher
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By cooling the oil below the ignition temperatureB
By removing the fuel source from the fireC
By excluding the oxygen from the fireD
By increasing the weight of the oil
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a mattressB
spilled liquids such as oil or paintC
high voltage electrical gearD
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solid materials such as wood or bales of fiberB
inflammable liquidsC
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solid materials such as wood or bales of fiberB
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单选题After using a C02 portable extinguisher,it should be（）.A
put back in service if some CO2 remainsB
hydrostatically testedC
retaggedD
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单选题Never extinguish oil and electrical fires with （）.A
waterB
foam extinguisherC
CO2 extinguisherD
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generatorsB
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单选题Which statement about firefighting foam is TRUE?（）A
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单选题Which types of portable fire extinguishers are designed for use on electrical fires?（）A
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generatorsB
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单选题Which is the proper method of determining whether a portable CO2 fire extinguisher needs recharging?（）A
Check the tag to see when the extinguisher was last chargedB
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Weigh the extinguisher and compare the weight against that stamped on the valveD
Recharge the extinguisher at least once each year
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单选题A portable foam fire extinguisher is placed in operation by（）A
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squeezing the grip handleD
opening the hose valve
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单选题As an extinguishing agent,foam（）.A
couducts electricityB
should be directed at the base of the fireC
is most effective on burning gases which are flowingD
extinguishes by cooling oil fires blow ignition temperature
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