cutting off the supply of oxygen
removing the fuel
cooling below the ignition temperature
spraying with water
第1题：
The emergency signal for fires is sounded on the ship’s whistle and general alarm as _____.
A.a continuous ringing for 10 seconds
B.one short ring followed by one long ring
C.two long rings of at least 20 seconds
D.a continuous ringing until the fire is extinguished
第2题：
A fire of escaping liquefied flammable gas is best extinguished by ______.
A.cooling the gas below the ignition point
B.cutting off the supply of oxygen
C.stopping the flow of gas
D.interrupting the chain reaction
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：
cutting off supply of oxygen
removing the fuel
cooling below the ignition temperature
spraying with water
第5题：
（）extinguish oil and electrical fires with water.
第6题：
The fuel oil supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler ______.
A.steam demand is high
B.salinity is high
C.safety valve simmers(爆发)
D.burner flame is extinguished
第7题：
As an extinguishing agent, foam ______.
A.conducts electricity
B.should be directed at the base of the fire
C.is most efffective on buring gases which are flowing
D.extinguishes by cooling oil fires below ignition temperature
第8题：
Oil fires are best extinguished by ______.
A.cutting off the supply of oxygen
B.removing the fuel
C.cooling below the ignition temperature
D.spraying with water
第9题：
Water can put out common fires, such as （）.
第10题：
visual inspection of the elements
the pressure drop across the filter
high lube oil sump temperature
decrease in oil viscosity from the filter