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 If the () of carbon dioxide in the atmosphere is increased as a result of air pollution. A. rateB. proportionC. extentD. amount

查看答案

考题 Combustion knock occurring in a diesel engine can be caused by _____.A.low coolant temperatureB.insufficient fuelC.high ambient temperatureD.carbon buildup on the injector tips

查看答案

考题 The ___________ of gases such as carbon dioxide should be stabilized at their present level. A、emissionB、emitC、radiationD、evaporation

查看答案

考题 It is pretty well understood ________ controls the flow of carbon dioxide in and out the atmosphere today. A、thatB、whatC、whenD、how

查看答案

考题 The effect that exhaust gas recirculation can reduce NOX formation is partly due to a reduction of the()concentration in the combustion zone and partly due to the content of water and carbon dioxide in the exhaust gas.A.OxygenB.NitrogenC.SulphurD.Freon

查看答案

考题 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

查看答案

考题 We all know that humans are damaging the environment，but what can we do about it?Some people are trying to do their bit to be more environmentally friendly.Local councils in Britain encourage certain aspects of green living，such as recycling paper，tin，plastic and glass. They want to reduce the amount of rubbish going into landfill sites(填埋场)，because they are running out of places to dump(倾倒)rubbish. In some areas rubbish for recycling is collected from your doorstep，but in other areas，you have to take it to a special recycling place，such as a bottle bank.Another way of reducing the amount of rubbish you create is to use reusable products instead of disposable ones. For example，some people use strong shopping bags or boxes for their groceries instead of plastic carrier bags，or use washable nappies instead of disposables.More people are becoming interested in reducing their carbon footprint-the amount of carbon they use up. They try to reduce their carbon emissions(释放)by cycling，using public transport or an electric car，rather than driving gas-consuming vehicles. Some people choose not to fly for holiday trips because planes are the biggest producers of carbon emissions.You can make“green”choices when buying food too. It's best to buy food which was locally grown or produced so that it hasn't been imported by air，or shipped by road from far away.Houses can be environmentally friendly too. It takes less energy to heat a house if it has good insulation(绝缘，隔热)and double glazing(双层玻璃). You can also create your own energy if you have solar panels or a wind turbine fitted though these can be expensive. You can also save water by using a rain water container for washing the car or watering the garden. It's even possible to use a system where“grey water”-water which has been through a tap(水龙头)once already，is used to flush(冲洗)toilets. Some new housing projects are being built specifically to be as environmentally friendly as possible.The purpose of collecting reusable wastes is to______.A．save energy consumed in daily lifeB．reduce the amount of rubbish dumpedC．create a new way of green livingD．decrease the amount of carbon produced

查看答案

考题 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

查看答案

考题 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

查看答案

考题 ______, 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

查看答案

考题 Passage 2 If the population of the earth goes on increasing at its present rate, there will eventually not be enough resources left to sustain life on the planet. By the middle of the 21st century, if present trends continue, we will have used up all the oil that drives our cars, for example. Even if scientists develop new ways of feeding the human race, the crowded conditions on earth will make it necessary for us to look for open space somewhere else. But none of the other planets in our solar system are capable of supporting life at present. One possible solution to the problem, however, has recently been suggested by an American scientist, Professor Carl Sagan. Sagan believes that before the earth's resources are completely exhausted it will be possible to change the atmosphere of Venus and so create a new world almost as large as earth itself. The difficulty is that Venus is much hotter than the earth and there is only a tiny amount of water there. Sagan proposes that algae organisms, which can live in extremely hot or cold atmospheres and at the same time produce oxygen, should be bred in conditions similar to those on Venus. As soon as this has been done, the algae will be placed in small rockets. Spaceships will then fly to Venus and fire the rockets into the atmosphere. In a fairly short time, the algae will break down the carbon dioxide into oxygen and carbon. When the algae have done their work, the atmosphere will become cooler, but before man can set foot on Venus it will be necessary for the oxygen to produce rain. The surface of the planet will still be too hot for men to land on it but the rain will eventually fall and in a few years something like earth will be reproduced on Venus. On Venus there is a lot of__________.A. water B. carbon dioxide C. carbon monoxide D. oxygen

查看答案

考题共用题干 Global WarmingFew people now question the reality of global warming and its effects on the world's climate. Many scientists1the blame for recent natural disasters on the increase2the world's temperatures and are convinced that,more than3before,the Earth is at4from the forces of the wind,rain and sun.5to them,global warming is making extreme weather events,6as hurricanes and droughts,even more7and causing sea levels all around the world to8.Environmental groups are putting9on governments to take action to reduce the 10 of carbon dioxide which is given 11 by factories and power plants,thus attacking the problem at its source. They are in12of more money being spent on research into so-lar,wind and wave energy devices,which could then replace existing power13.Some scientists,14believe that even if we stopped releasing carbon dioxide and other gases into the atmosphere tomorrow,we would have to wait15hundred years to notice the results. Global warming,it seems,is here to stay.2._________A: in B: at C: by D: to

查看答案

考题共用题干 Global WarmingFew people now question the reality of global warming and its effects on the world's climate. Many scientists1the blame for recent natural disasters on the increase2the world's temperatures and are convinced that,more than3before,the Earth is at4from the forces of the wind,rain and sun.5to them,global warming is making extreme weather events,6as hurricanes and droughts,even more7and causing sea levels all around the world to8.Environmental groups are putting9on governments to take action to reduce the 10 of carbon dioxide which is given 11 by factories and power plants,thus attacking the problem at its source. They are in12of more money being spent on research into so-lar,wind and wave energy devices,which could then replace existing power13.Some scientists,14believe that even if we stopped releasing carbon dioxide and other gases into the atmosphere tomorrow,we would have to wait15hundred years to notice the results. Global warming,it seems,is here to stay.10._________A: amount B: deal C: number D: count

查看答案

考题 A round trip flight from Britain to Australia produces the same amount of carbon dioxide as three average cars do in a year.A.Right B.Wrong C.Not mentioned

查看答案

考题填空题Glucose can be completely broken down into carbon dioxide and water when oxygen is present in the process called aerobic respiration.____

查看答案

考题单选题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

查看答案

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.

查看答案

考题单选题Which of the following characteristic of lube oil helps to reduce the amount of deposits in the piston ring belt during the combustion process in a diesel engine?（）A Low viscosity indexB Low carbon forming tendenciesC High film strengthD High non-corrosive qualities

查看答案

考题单选题As compared to carbon dioxide,dry chemical has which advantage?（）.A CleanerB EffectiveC Greater rangeD More cooling effect

查看答案

考题单选题The primary purpose of the passage is to _____.A warn of the dangers of continued burning of fossil fuelsB discuss the significance of the amount of carbon dioxide in the atmosphereC demonstrate the usefulness of mathematical models in predicting long-range climatic changeD describe the ways in which various atmospheric and climatic conditions contribute to the Earth’s weather

查看答案

考题单选题As compared to carbon dioxide，dry chemical has which advantage?（）.A CleanerB Effective on metal firesC Greater rangeD More cooling effect

查看答案

考题单选题The supply of carbon dioxide used in the fixed extinguishing system aboard a cargo vessel MUST be at least sufficient for（）.A all the spaces of a vesselB all cargo spacesC the engine room and largest cargo spaceD the space requiring the largest amount

查看答案

考题单选题The danger associated with using carbon dioxide in an enclosed space is（）.A frostbiteB skin burnsC asphyxiationD an explosive reaction

查看答案

考题单选题According to the passage, which of the following is true of the last hundred years?A Fossil fuels were burned for the first time.B Greater amounts of land were cleared than at any time before.C The average temperature at the Earth’s surface has become 2℃ cooler.D The amount of carbon dioxide in the atmosphere has increased measurably.

查看答案

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

查看答案

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

查看答案

考题单选题According to the T-Boat regulations the reason for providing adequate ventilation for a battery storage area is to prevent（）.A accumulation of carbon dioxide gas that chokes the batteryB accumulation of explosive and toxic gases the battery can generateC mildew or dry rot in the battery boxD battery failure including battery case meltdown caused by excessive heat

查看答案

考题单选题Plants use the carbon, along with sunlight, for growth, and （） oxygen into the atmosphere in a process known as photosynthesis.A relieveB relateC releaseD retain

查看答案

网友您好，请在下方输入框内输入要搜索的题目：

更多 “判断题Natural systems can reduce the amount of carbon dioxide in the atmosphere caused by carbon emissions.A 对B 错” 相关考题

网友您好， 请在下方输入框内输入要搜索的题目：

更多 “判断题Natural systems can reduce the amount of carbon dioxide in the atmosphere caused by carbon emissions.A 对B 错” 相关考题

网友您好，请在下方输入框内输入要搜索的题目：