water
foam extinguisher
CO2 extinguisher
portable extinguisher
第1题：
One of the limitations of foam as an extinguishing agent is that foam ______.
A.cannot be made with salt water
B.is heavier than oil and sinks below its surface
C.is corrosive and a hazard to fire fighters
D.conducts electricity
第2题：
A foam-type portable fire extinguisher would be most useful in combating a fire in ______.
A.solid materials such as wood or bales of fiber
B.flammable liquids
C.a piece of electrical equipment
D.combustible metallic solid
第3题：
Dry powder is used to put out ________
A.electrical fire
B.oil fire
C.common fires
D.all kinds of fires
第4题：
How does foam extinguish an oil fire ?______.
A.By cooling the oil below the ignition temperature
B.By removing the fuel souce from the fire
C.By excluding the oxygen from the fire
D.By increasing the weight of the oil
第5题：
A portable foam (stored-pressure type) fire extinguisher would be most useful in combating a fire in ______.
A.generators
B.oil drums
C.the bridge controls
D.combustible metals
第6题：
A foam-type portable fire extinguisher is most useful in fighting a fire in ______.
A.generators
B.oil drums
C.the bridge controls
D.combustible metals
第7题：
A portable dry chemical fire extinguisher discharges by ______.
A.gravity when the extinguisher is turned upside down
B.pressure from a small CO2 cartridge on the extinguisher
C.air pressure from the hand pump attached to the extinguisher
D.pressure from the reaction when water is mixed with the chemical
第8题：
On a vessel, a CO2 extinguisher is checked by ______.
A.reading the gage pressure
B.weighing the extinguisher
C.discharging a small amount of CO2
D.seeing if the seal has been broken
第9题：
Foam-type portable fire extinguishers are most useful in combating fires involving ______.
A.solid materials such as wood or bales of fiber
B.inflammable liquids
C.electrical equipment
D.metallic solids
第10题：
Close all fire doors and use the （）（干粉灭火器）.