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
51
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
TheEffectsofGlobalWarmingAlthoughtheterm“globalwarming”hasbecomeincreasinglyfamiliartothegeneralpublic,a
TheConquestofDistanceIn1848,pioneerswhocrossedtheAmericancontinentintheirwagonsmadethetripin109days.
TheGreatestShowonEarthTheOlympicGames(奥林匹克运动会)arethegreatestfestivalofsportintheworld.Everyfouryears,a
Accordingtothepassage,whichofthefollowingisthemostpollutingenergyresource?Whichcountrytooktheleadinmakingu
AccordingtoRobertBell,ifmobilephonesprovetobedangeroustopeople’shealth,Thisarticlemainlyarguesthat
PlantsinDesertOnlyspecialplantscansurvivetheterribleclimateofadesert,fortheseareregionswhentheannualrange
A.ChinafailedtodevelopasinglewrittenlanguagebasedonphoneticsB.aChinesechildissupposedtolearnmuchmorewords
YouthEmancipationinSpainTheSpanishGovernmentissoworriedaboutthenumberofyoungadultsstilllivingwiththeirpa
CanalToday,mostcountriesintheworldhavecanals.Eveninthetwentiethcentury,goodscanbemovedmorecheaplybyboat(51)
Therevelationofhispastledtohisresignation.
随机试题
血清铁蛋白在缺铁的ID期即已降低,是诊断缺铁ID期的敏感指标。
妊娠最早、最重要的症状是()
头围与胸围大致相等的年龄是()
我国B公司以CFR价出口货物一批,装运后即以电报形式向买方发出装船通知,但对方没有收到通知,因而未及时投保,结果船在运输途中沉没,货物全部损失.买方向我方提出索赔,我方应如何处理?如果此事系我方未及时发出装船通知引起的,又该如何处理?
甲公司从事房地产开发经营业务,对投资性房地产采用成本模式进行后续计量。甲公司的财务经理在复核2017年度财务报表时,对以下交易或事项会计处理的正确性难以作出判断:(1)1月1日,因商品房滞销,董事会决定将两栋商品房用于对外出租。1月20日,甲公司与乙公司
社区的基本要素应包括()。
在中国教育制度发展史上,中学阶段最早兼顾升学和就业双重需要的学制是()。
面对大剧院热闹的歌剧景象和观众热烈欢呼的场面,最近,《纽约时报》发表评论,对中国歌剧发展大加赞扬,对此,歌剧理论家、南京艺术学院教授居其宏持不同观点。他认为,衡量一个国家歌剧艺术的发展状况,原创作品质量更具根本性,而当下中国歌剧的原创作品质量普遍较低,戏不
Undercurrentfederallaw,employersareallowedtooffertheiremployeesfreeparkingspacesasatax-freebenefit,buttheyca
Ifyou’vebeenoncampusforverylong,I’mcertainthatyou’vealreadyheardaboutthiscourse.Youmayknowthatlasttermabo
最新回复
(
0
)