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单选题
What is NOT a characteristic of carbon dioxide fire-extinguishing agents?（）
A
Effective even if ventilation is not shut down
B
Will not deteriorate in storage
C
Non-corrosive
D
Effective on electrical equipment
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What could result in an incorrect oxygen concentration reading on the oxygen indicator ________．A.Exposure to carbon dioxide for no more than 1 minuteB.Exposure to carbon dioxide for more than 10 minutesC.Exposure to a very low concentration of sulfur dioxide for no more than 2 minutesD.None of the above
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The most effective way of applying carbon dioxide from a portable extinguisher to a fire is by ______．A.Forming a cloud cover over the flamesB.Directing the gas at the base of the flames in a slow sweeping motionC.Discharging the carbon dioxide into the heart of the flamesD.Bouncing the discharge off an adjacent bulkhead just above the burning surface
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______, as the chemical extinguisher agent, should be used for an electric fire.A.dry chemical or foamB.foam or soda acidC.carbon dioxide or foamD.carbon dioxide or dry chemical
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单选题As compared to carbon dioxide，dry chemical has which advantage?（）.A
CleanerB
Effective on metal firesC
Greater rangeD
More cooling effect
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填空题Glucose can be completely broken down into carbon dioxide and water when oxygen is present in the process called aerobic respiration.____
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单选题The discharge from a carbon dioxide fire extinguisher should be directed（）.A
at the base of the flamesB
at the center of the flamesC
to the lee side of the flamesD
over the tops of the flames
考题
单选题An advantage of an ABC dry chemical over a carbon dioxide extinguisher is（）.A
lack of toxicityB
the multipurpose extinguishing abilityC
burn-back protectionD
cooling ability
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单选题The danger associated with using carbon dioxide in an enclosed space is（）.A
frostbiteB
skin burnsC
asphyxiationD
an explosive reaction
考题
问答题Practice 5 The world's oceans are slowly getting more acidic, say scientists. The researchers from California say the change is taking place in response to higher levels of carbon dioxide in the atmosphere. The lowering of the waters' pH value is not great at the moment but could pose a serious threat to current marine life if it continues, they warn. Ken Caldeira and Michael Wickett, from the Lawrence Livermore National Laboratory, report their concerns in the journal Nature. Increasing use of fossil fuels means more carbon dioxide is going into the air, and most of it will eventually be absorbed by seawater. Once in the water, it reacts to form carbonic acid. Scientists believe that the oceans have already become slightly more acidic over the last century. But these researchers have tried to predict what will happen in the future by combining what we know about the history of the oceans with computer models of climate change. "This level of acidity will get much more extreme in the future if we continue releasing CO2 into the atmosphere," said Dr Caldeira. "And we predicted amounts of future acidity that exceed anything we saw over the last several hundred million years, apart from perhaps after rare catastrophic events such as asteroid impacts." If carbon dioxide release continues unabated, ocean pH could be reduced by as much as 0.77 units, the authors warn. It is not absolutely clear what that means for marine life, however. Most organisms live near the surface, where the greatest pH change would be expected to occur, but deep-ocean lifeforms may be more sensitive to pH changes. Coral reefs and other organisms whose skeletons or shells contain calcium carbonate may be particularly affected, the team speculate. They could find it much more difficult to build these structures in water with a lower pH. In recent years some people have suggested deliberately storing carbon dioxide from power stations in the deep ocean as a way of curbing global warming. But Dr Caldeira said that such a strategy should now be re-considered. "Previously, most experts had looked at ocean absorption of carbon dioxide as a good thing — because in releasing CO2 into the atmosphere we warm the planet; and when CO2 is absorbed by the ocean, it reduces the amount of greenhouse warming.
考题
单选题According to the passage, atmospheric carbon dioxide performs all of the following functions EXCEPT: _____.A
absorbing radiation at visible wavelengthsB
absorbing infrared radiationC
absorbing outgoing radiation from the EarthD
helping to retain heat near the Earth’s surface
考题
单选题If the hydrostatic release mechanism for an inflatable liferaft is not periodically serviced and becomes inoperative，it will NOT（）.A
set the water lights on immersionB
release the dye-marker from the liferaftC
free the liferaft from the vesselD
break the seal on the carbon dioxide cylinder
考题
单选题An advantage of a dry chemical over a carbon dioxide fire extinguish is its（）.A
greater rangeB
effective on all types of firesC
cleanlinessD
All of the above
考题
单选题As compared to carbon dioxide,dry chemical has which advantage?（）.A
CleanerB
EffectiveC
Greater rangeD
More cooling effect
考题
单选题According to the Chemical Data Guide，when burning，the grade B flammable liquid，carbon disulfide produces（）.A
phosgene gasB
sulfuric acid gasC
sulfur dioxide gasD
carbon tetrachloride
考题
单选题Carbon dioxide as a fire fighting agent has which advantage over other agents?（）.A
It causes minimal damageB
It is safe for personnelC
It is cheaperD
It is most effective on a per unit basis
考题
单选题Controls for a fixed carbon dioxide system shall be mounted（）.A
directly outside the space protected by the systemB
as near the gas cylinders as possibleC
in the pilothouseD
on the main deck near the bow
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单选题Theoretical perfect combustion in a diesel engine yields by-products of （）.A
aldehydes and carbon dioxideB
water vapor and carbon monoxideC
nitrogen and carbon monoxideD
water vapor and carbon dioxide
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单选题Which of the following statements is true concerning carbon dioxide when used as a fire extinguishing agent?（）A
Carbon dioxide is corrosive when exposed to fireB
Carbon dioxide should be applied slowly to a large engine room fireC
Its total cooling effect is far greater than waterD
Its smothering effect is excellent for class B fires
考题
单选题Fire in an engine compartment is best extinguished with carbon dioxide gas (CO2) and by（）.A
completely closing the compartmentB
closing the compartment except for the ventilatorsC
leaving the compartment open to the airD
increasing the air flow to the compartment by blowers
考题
单选题Which types of portable fire extinguishers are designed for use on electrical fires?（）A
Dry chemical and carbon dioxideB
Foam (stored pressure) and soda-acidC
Carbon dioxide and foam (stored pressure)D
Dry chemical and soda-acid
考题
判断题Natural systems can reduce the amount of carbon dioxide in the atmosphere caused by carbon emissions.A
对B
错
考题
单选题Why should you wear a self-contained breathing apparatus before entering the engine room after the fixed CO2 system has been discharged to combat a major fire?（）A
Because carbon dioxide dilutes the oxygen concentration in the atmosphere and may cause asphyxiationB
Because carbon dioxide breaks down in a fire into carbon monoxide which may cause blood poisoning in the person breathing this gasC
Because carbon dioxide is a colorless and odorless gas that becomes highly toxic in the presence of high temperatures and will quickly incapacitate a person exposed to this gasD
This action is unnecessary as carbon dioxide is not poisonous nor toxic but is a relatively harmless gas
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