首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Geothermal(地热)Energy 1 Since heat naturally moves from hotter regions to cooler ones, the heat from the earth’ s center flows ou
Geothermal(地热)Energy 1 Since heat naturally moves from hotter regions to cooler ones, the heat from the earth’ s center flows ou
admin
2016-08-16
62
问题
Geothermal(地热)Energy
1 Since heat naturally moves from hotter regions to cooler ones, the heat from the earth’ s center flows outwards towards the surface. In this way, it transfers to the next layer of rock. If the temperature is high enough, some of this rock melts and forms magma(岩浆). The magma ascends in its turn towards the earth’ s surface. It often remains well below the earth’ s surface, creating vast areas of hot rock. In such regions, there are deep cracks, which allow rainwater to descend underground. Some of the heated rainwater travels back up to the earth’ s surface where it will appear as a hot spring. However, if this ascending hot water reaches a layer of impermeable(不可渗透的)rock, it remains trapped, forming a geothermal reservoir. If geothermal reservoirs are close enough to the surface, they can be reached by drilling wells. Hot water and steam shoot up the wells naturally, and can be used to produce electricity in geothermal power plants.
2 A few geothermal power plants depend on dry-steam reservoirs which produce steam but little or no water. In these cases, the steam is piped up directly to provide the power to spin a turbine(涡轮)generator. The first geothermal power plant, constructed at Lardarello in Italy, was of this type, and is still producing electricity today.
3 Most currently operating geothermal power plants are either "flash" steam plants or binary(双重的)plants. Flash plants produce mainly hot water ranging in temperature from 300° to 700°Fahren-heit. This water is passed through one or two separators where released from the pressure of the underground reservoir, it "flashes" or boils into steam Again, the force of this steam provides the energy to spin the turbine and produce electricity. The geothermal water and steam are then reinjected directly back down into the earth to maintain the volume and pressure of the reservoir. Gradually they will be reheated and can then be used again.
4 A reservoir with temperatures below 300° Fahrenheit is not hot enough to flash steam,but it can still be used to generate electricity in binary fluid. The steam from this is used to power the turbines. As in the flash steam plants, the geothermal water is recycled back into the reservoir.
A Dry steam plants
B Binary plants
C Origin of geothermal energy
D Generation of electricity
E Flash steam plants
F Recyclable water and steam
Paragraph 1______
选项
答案
C
解析
本段首句讲到热能是从炎热地区向寒冷地区流动,所以热能也是从地心向地球表面流动。接着又讲地热熔化了石头变成岩浆,雨水渗入岩浆烘热的岩石缝形成温泉,若遇到不可渗透的岩石则形成地热储层,可就势建起地热发电厂。故C项“地热能的起源”可以概括本段。
转载请注明原文地址:https://kaotiyun.com/show/E6Ld777K
本试题收录于:
职称英语理工类B级题库职称英语分类
0
职称英语理工类B级
职称英语
相关试题推荐
Weareawareofthepotentialproblems.
A.QuickerrecoveryfromillnessB.AlongerlifeforoptimistsC.RelationshipbetweengoodhealthandoptimismD.Apositivew
OptimistsReallyDoLiveLonger,SayScientists1.ForthephilosopherArthurSchopenhaueroptimismwasfundamentallywrongb
DebateovertheUseofRenewableEnergyAmusableofRockefellerUniversityinNewYork,USsaysthekeyrenewable(可再生的)ene
DebateovertheUseofRenewableEnergyAmusableofRockefellerUniversityinNewYork,USsaysthekeyrenewable(可再生的)ene
WhoisUncleSam?"UncleSam",ofcourse,standsfortheUnitedStates.Itisthenickname(绰号)ofthecountry.Itishardtobel
Leadispotentiallydamagingtochildren’shealth.
Theideawasquitebrilliant.
ElectronicTeachingThepotentialofclosed-circuittelevisionandothernewelectronicteachingtoolsissogreatthatiti
Theideawasquitebrilliant.
随机试题
什么叫自动控制?什么叫自动控制系统?
A、Thesizeisnotlargeenough.B、Thematerialisnotgood.C、Thecolorisnotsuitable.D、Thestyleisnotforaman.C
A.梗死灶呈节段性B.梗死灶呈锥形C.梗死灶呈地图状D.梗死灶呈圆形肠梗死
为有效预防压疮,应综合、动态、客观、有效地评估压疮发生的()、()和()。
()原则适用于划分各期收入和费用。
适合集装箱化货物的特征有()。
心理契约是指个体与组织之间隐含的没有明文规定的双方各自的责任及对对方的期望。根据上述定义,下列属于建立心理契约的措施的是()。
“幸福的家庭都是相似的,不幸的家庭各有各的不幸”出自列夫.托尔斯泰的《____________》。(暨南大学2017)
WhenCarolynKurlefirstvisitedAlaska’sHawadaxIsland,thenknownasRatIsland,sheimmediatelynoticedthesilence."When
Mr.Smithhasboughtalotofbooksforhisdaughter,______he?
最新回复
(
0
)