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
69
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 4______
选项
答案
F
解析
本段主要讲了中等水温(低于300度)的地热水是如何循环发电的,故选F“可再循环的水和蒸汽”。
转载请注明原文地址:https://kaotiyun.com/show/FhGd777K
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
Frostbittenfingersandtoesshouldbetreatedwithlukewarmwater.
PricePlanningApricerepresentsthevalueofagoodsorserviceforboththesellerandthebuyer.Priceplanningissyst
Bythetimethewarbrokeout,mostofthepeoplehadalreadyleft.
ChangesinMuseumsMuseumshavechanged.Theyarenolongerplacesthatone“should”visit,theyareplacestoenjoyandl
DisfigurementofBusinessmanIntherelationshipofeducationtobusinessweobservetodayafinestateofparadox.Onthe
A.rarelyissuccesssomysteriousB.largerewardsfollowC.IeliminatethecandidateD.weshoulddropthemandmovetosometh
RecyclingAroundtheWorldRecyclingisoneofthebestenvironmentalsuccessstoriesofthelate20thcentury.Butwecoulddo
Pesticides(杀虫剂)Whydopesticides(杀虫剂)fitintothepictureofenvironmentaldisease?Wehaveseenthattheynowpollutesoi
随机试题
评价粒细胞输注疗效的最佳指标是
A.先兆流产B.难免流产C.不全流产D.完全流产E.稽留流产患者女性,30岁。停经4个月,曾有阴道流血史.现尿妊娠试验(-)。妇科检查:子宫孕8周大小。应诊断为
动物诊疗机构连续停业()年以上的,或者连续()年未向发证机关报告动物诊疗活动情况,拒不改正的,由原发证机关收回、注销其动物诊疗许可证
患儿男,5岁。睡中经常遗尿,一夜1~2次,甚则数次,醒后方觉。伴面色苍白,神疲乏力,肢凉怕冷,腰腿疫软,下肢无力,小便清长,舌质较淡。治疗首选方剂为
项目采购管理工作过程中,以买方和卖方签订合同作为可交付成果的过程是()。
以下对十字板剪切试验成果应用的提法中,()是错误的。
下列有关生活常识,正确的有()。
减小抽样方案的AQL值意味着()。
可以实现“门至门”运输的运输方式为()运输。
Youbookedaholidaywithatravelagencybutthetourdidnotliveuptoyourexpectations.Writealettertotheagency.Inyo
最新回复
(
0
)