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
Widespread adoption of plug-in electric vehicles could dramatically cut greenhouse gas pollution and reduce U.S. dependence on f
Widespread adoption of plug-in electric vehicles could dramatically cut greenhouse gas pollution and reduce U.S. dependence on f
admin
2023-02-20
7
问题
Widespread adoption of plug-in electric vehicles could dramatically cut greenhouse gas pollution and reduce U.S. dependence on foreign oil. But results of an electric-car pilot project presented recently at the annual meeting of the American Association for the Advancement of Science provide added incentive to go electric: Car owners could return unused electricity back to the grid (输电网) and make real money while doing it.
Electric cars need big, powerful batteries to accelerate to highway speeds and travel scores or even several hundred kilometers on a single charge. But because most drivers drive just a few dozen kilometers a day, most of that battery capacity sits unused. To take advantage of that storage capacity, Willett Kempton, director of the University of Delaware’s Center for Carbon-Free Power Integration in Lewes, teamed up with an electric car maker, several utilities, a software company, and PJM Interconnection, one of 10 regional organizations that coordinate and control the U.S. electrical grid.
To ensure that electricity flows steadily and without interruption, the U.S. government requires PJM Interconnection and its counterparts to have reserves of power in case a generator goes down and other electrical reserves to maintain the 60-Hz frequency of alternating current that our appliances and devices are accustomed to dealing with. Today, PJM Interconnection and its counterparts pay conventional power plants to maintain this reserve power. But as renewable energy sources such as wind and solar, which provide energy cleanly but intermittently, come online, these grid operators need to increase their storage capacity to ensure a steady electricity supply. So Kempton and his colleagues set out to provide some of the backup power from a fleet of parked electric cars.
Kempton’s team used an electric car from AC Propulsions, a California car company, which was custom-built to provide electricity back to the grid. They used commercially available software and hardware that companies such as PJM Interconnection use to monitor and control energy flow. In November, the company hooked the grid up to the car, and Kempton’s team’s electric car became the first car in the world to earn its keep as a backup electric power source. At the rates that PJM Interconnection pays today to maintain power reserves, a hooked-in electric car could generate $1,800 a year for its owner.
"I think it’s tremendously exciting," says Kathryn Clay, director of research for the Alliance of Automobile Manufacturers. "The extra dollars an electric car provides will not be enough by themselves to get consumers to adopt grictenabled vehicles—for that we also need better and less expensive batteries and tax incentives to give the market an encouragement" Nevertheless, "it’s an incentive to push in the right direction."
What do most electric car owners do every day?
选项
A、They charge the battery to travel hundreds of kilometers.
B、They recharge before the battery storage is used up.
C、They charge the battery so as to reach highway speeds.
D、They use only a minority of the battery storage.
答案
D
解析
原文该句中的most of that battery capacity sits unused表明电动车车主每天只使用电池容量的很少一部分,由此可见D是对原文内容同义改写,故为本题答案。A“他们给电池充电,以便行驶几百公里”、B“他们给电池充电以达到高速行驶的速度”都是利用文中个别词拼凑的干扰项;原文没有提及电池用完前充电。排除C。
转载请注明原文地址:https://kaotiyun.com/show/yuvD777K
0
大学英语六级
相关试题推荐
Inordertolearnaforeignlanguagewell,itisnecessarytoovercomethefearofmakingmistakes.Iftheprimarygoaloflangu
A:Youlookunhappy.【D1】________B:Oh,justbecauseofmyparents.Theyarealwaysarguing.A:Forwhat?B:Myweekendactivity
Icameacrossanoldcountryguidebooktheotherday.Itlistedallthetradesmenineachvillage,anditwasimpressivetosee
Whilenormalfloodsresultingfromusualmonsoonrainfallare________thegrowthofcrops,recentlytherehasbeenanincreasein
Themajor________ofsuchpopularhistoryisthatitbetraysnointerestsinmakingintellectualcontributionstoourunderstandi
Carrinsiststhattheso-calledinformationsocietymightbemoreaccuratelydescribedastheinterruptionsociety:it________at
Researchonfriendshiphasestablishedanumberoffacts,someinteresting,someevenuseful.Didyouknowthattheaveragestud
沙漠里真有魔鬼吗?在那时人们的知识水平看起来,确像是有魔鬼在作怪。但是人们掌握了自然规律以后便可把这种光怪陆离的现象说清楚。这种现象在大戈壁夏天中午是常见的。当人们旅行得渴不可耐的时候忽然看见一个很大的湖。里面蓄着碧蓝的清水,看来并不很远。当人们欢天喜地向
(1)Weknowthephysicalbenefitsexercisehasonourbodies,butthewondersitcandoforyourbrainaren’tlimitedeither."I
A、Bothareusefulandimportant.B、Hissmartphoneismoreuseful.C、Heuseshiscomputermoreoften.D、Hecandowithouteither
随机试题
休克工期微循环灌流特点是
患者便血,兼见气短乏力,面白无华,自汗,舌淡白,脉弱,属于()
以下关于行政诉讼受案范围的表述错误的是:
相比传统的吹缆方式,气吹微缆的优点有()。
企业在对会计要素进行计量时,一般应当采用公允价值。采用重置成本、可变现净值、现值、公允价值计量的,应当保证所确定的会计要素金额能够持续取得并可靠计量。()
某高新技术企业2019年5月份开业,注册资金220万元,当年发生经营活动如下:(1)领受工商营业执照、房屋产权证、土地使用证各1份;建账时共设8个账簿,其中资金账簿中记载实收资本220万元。(2)签订购销合同4份,共记载金额280万元;
下列选项中,符合所给图形的变化规律的是______。
注意事项1.本题本由给定资料与作答要求两部分构成。考试时限为180分钟。其中,阅读给定资料参考时限为60分钟,作答参考时限为120分钟。满分100分。2.请在题本、答题卡指定位置上用黑色字迹的钢笔或签字笔填写自己的姓名和准考证号,并用2B铅笔在准考证号
上请制度最早确立于
Youwillfindthematter______aboutalloverthecompany.
最新回复
(
0
)