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
48
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°Fahrenheit. 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 2______
选项
答案
A
解析
本段首句讲到地热发电厂利用干蒸汽库产生蒸汽而几乎不产生水来发电。故选A“干蒸汽发电”。
转载请注明原文地址:https://kaotiyun.com/show/ThGd777K
本试题收录于:
职称英语理工类A级题库职称英语分类
0
职称英语理工类A级
职称英语
相关试题推荐
AdultEducationVoluntarylearninginorganizedcoursesbymaturemenandwomeniscalledadulteducation.Sucheducation
TheRailwayLaborMediationActof1926supportedtheuseofcollectivebargainingtoavertinterruptionofrailservice.
Beforeherbswereavailableinsupermarketsyear-round,herbvinegarwasmadeinthefall.
A.rarelyissuccesssomysteriousB.largerewardsfollowC.IeliminatethecandidateD.weshoulddropthemandmovetosometh
RenewableEnergySourcesTodaypetroleum(石油)providesaround40%oftheworld’senergyneeds,mostlyfuellingautomobiles.C
Accordingtothepassage,whichofthefollowinghaschangedthemostinthelast500years?Whichcountryisthelargestcoffe
Thestrongstormdidlotsofdamagetothiscoastalvillage:severalfishingboatsaredestroyedandmanyhousesarecollapsed.
A.ChinafailedtodevelopasinglewrittenlanguagebasedonphoneticsB.aChinesechildissupposedtolearnmuchmorewords
Thedentisthasdecidedtoextractherbadtooth.
A.EarlycareerB.ChildhoodC.ProductsD.RetirementE.CosmeticsempressF.Birth*
随机试题
WhydidMr.Greenmakethiscall?
男,45岁,上消化道出血,经胃镜证实为食管静脉曲张破裂出血,既往有乙肝病史,目前肝功能有轻度损害,应选择哪种术式,既能预防食管曲张静脉再出血,又对肝功能影响小
患者,女,45岁,反复发作脓血便10余年,此期间有时伴膝关节疼痛,多次大便细菌培养阴性,X线钡剂检查见乙状结肠袋消失,肠壁变硬,肠管变细。该病腹痛的特点是
若王某已经年满16岁,则其行为构成什么犯罪?王某是否可以向人民法院起诉要求获得刑事赔偿?
拟建某冶金企业年产钢200万t,工作制度为年工作365天,厂址地处丘陵地带,坡角度在20°~30°,丘与丘之间距离紧密。据调查,企业纳污水体全长约为128km,流域面积为1200k2,年平均流量为78m3/s,河宽为30~50m,水深为5~7m,枯水期为
危险化学品运输企业,应对()类人员进行有关安全知识培训。
船名为“0005E”。( )该批货物的唛码应为“Container/sealNo.JKD20518”。( )
永续盘存记录应由()。
在财务分析中,资料来源局限性的具体表现包括()。
公安机关是()。
最新回复
(
0
)