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
专升本
Leading scientists around the world are meeting in Britain to consider a proposal that could eventually see Greenwich Mean Time
Leading scientists around the world are meeting in Britain to consider a proposal that could eventually see Greenwich Mean Time
admin
2016-03-01
81
问题
Leading scientists around the world are meeting in Britain to consider a proposal that could eventually see Greenwich Mean Time become a footnote in history. For more than 120 yeas GMT has been the international standard for timekeeping, but it is now under threat from a new definition of time itself based not on the rotation of the Earth, but on atomic clocks.
GMT is based on the passage of the Sun over the zero meridian line(子午线)at the Greenwich Observatory in southeast London, and became the world standard for time at a conference in Washington in 1884, France had promoted Paris Mean Time at the same conference. In 1972 it was replaced in name by Universal Coordinated Time(UTC)but that essentially remained the same as GMT, UTC is based on about 400 atomic clocks at laboratories around the world but then corrected with " leap seconds "(闰秒)to adjust itself in line with the Earth’s rotational speed, which fluctuates.
But the tiny difference between Earth speed and atomic speed have become a problem for GPS, the globalpositioning systems and mobile phone networks on which the modern world relies.
The meeting in London are looking at the possible effects of abandoning the leap seconds and moving fully to atomic time. That would see atomic time slowly move apart from GMT, by about one minute every 60 to 90 years, or by an hour every 600 years, and there would need to be" leap minutes " a couple of times a century to bring the two in line. British science minister David Willetts has opposed the plan by saying: " We should stick to real time as experienced by humans. Without leap seconds we will lose contact with the reality of Earth’s rotation. Eventually our midnight would happen at noon. "
In January, the International Telecommunication Union will meet in Geneva to vote on whether to adopt the new measure, despite protests from Britain.
Leap minutes can be used to______.
选项
答案
adjust atomic speed in line with Earth speed.
解析
概括细节题。此题稍难,但可以从第二段末句找到并概括出答案。
转载请注明原文地址:https://kaotiyun.com/show/ULHC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
Themeetingwas_____whenthechairmanfellill.
TheChineseare____braveandhardworkingpeople.
AmajornewdevelopmentinsystemofworkinBritainis【B1】______Flexibleworkinghours,or"Flextime",arecatchingon(流行)fast,
AmajornewdevelopmentinsystemofworkinBritainis【B1】______Flexibleworkinghours,or"Flextime",arecatchingon(流行)fast,
Stillnotsurewhyyoushouldbelearningaforeignlanguage?Herearesomeverygood【B1】______.First,aforeignlanguagemake
Stillnotsurewhyyoushouldbelearningaforeignlanguage?Herearesomeverygood【B1】______.First,aforeignlanguagemake
Oneofthemoreimportantcommunicativetasksmayconfrontatraveler.Thatisthe【B1】______ofwhenaspeakerhassaid"no".Tha
—HI,Mary,Iheardyougetaheavyheadache.Howareyoufeelingtoday?—Thanks!【D1】______—Youshouldhaveagoodrest.—【D2
SpeakerA:______.Youweredoing45ina30-mile-an-hourzone.SpeakerB:Sorry,sir.ButIhavealreadybeenlateforanimpo
随机试题
和某有一对宋代汝窑青釉三足瓷笔洗,堪称笔洗中的传世佳作,估价在每只笔洗1000万元人民币左右。纪某是著名的瓷器收藏家,一直希望能够将该笔洗收入自己的藏品之中。请根据题设,回答问题。设和某因车祸不幸身亡,其子和二继承了该对笔洗,纪某上门提出以1
下列青霉素中,因其耐酸而可口服的是
病人,女性,40岁,心脏病,上二层楼时感心悸、气促,休息10分钟左右可好转。对病人活动量的限定是
下列文件不属于项目成本控制依据的是()
以下属于建造师不予注册情形的是()。
甲上市公司(以下简称甲公司)经批准于2017年1月1日以50400万元的价格(不考虑相关税费)发行面值总额为50000万元的可转换公司债券。该可转换公司债券期限为5年,票面年利率为3%,实际年利率为4%。自2018年起,每年1月1日支付上年度利息。自20
福耀集团是一家专业生产汽车安全玻璃的中外合资企业,是我国国内生产规模最大、技术水平最高、出口量最大的汽车玻璃生产供应商,1987年成立于福建省福州市,并迅速发展成为全球最大的汽车安全玻璃生产基地。2014年,福耀集团继在俄罗斯建设第一个工厂后,又在美国俄亥
领导用人就是指用干部。()
根据我国《宪法》和法律,下列有关国家机构职权的表述中哪些是错误的?
NarratorListentopartofaconversationbetweenastudentandaprofessor.Nowgetreadytoanswerthequestions.You
最新回复
(
0
)