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
考研
Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK
Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK
admin
2022-01-04
44
问题
Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 times faster than ’superfast’ broadband. The fastest speed【C1】________reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】________a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】________.
The term Li-Fi was【C4】________by Edinburgh University’s Prof Harald Haas【C5】________the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】________its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】________the electromagnetic spectrum, but【C8】________Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】________advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】________Li-Fi signals work by【C11】________bulbs on and off【C12】________quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】________several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council.
Existing LED light bulbs could be【C14】________to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】________with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】________to the point that they were not visible to humans and yet still【C17】________. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】________solid materials.
The makers of Li-Fi note that this quality might actually be an advantage in some【C19】________making Li-Fi more【C20】________than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.
【C13】
选项
A、stream
B、move
C、stir
D、float
答案
A
解析
空格需要填入能与several lines of data搭配的谓语动词。上一句提到了Li-Fi信号是如何实现传输的,本句顺接上文,表明利用微小的LED灯泡来实现。A项stream有“照射”的意思,与lines of data搭配指传送数据,因为data的传输靠的就是灯泡照射出来的光线。B项move“移动”、C项stir“搅动”及D项float“浮动”都是表示具体动作,无法与Li-Fi信号及数据这样的抽象名词对应,语义上也不符合空格前后的逻辑。
转载请注明原文地址:https://kaotiyun.com/show/kKY4777K
0
考研英语二
相关试题推荐
Theremarkableprogressofscienceandtechnologyinthe20thcenturyhasbroughtenormousbenefitstohumankind.Longandhealt
A.TheconsequenceoflosingbonesB.AbetterlabthanonearthC.TwodifferentcasesD.Multipleeffectsformwei
A.TheconsequenceoflosingbonesB.AbetterlabthanonearthC.TwodifferentcasesD.Multipleeffectsformwei
Beautyhasalwaysbeenregardedassomethingpraiseworthy.Almosteveryonethinksattractivepeoplearehappierandhealthier,h
Telecommuting,Internetshoppingandonlinemeetingsmaysaveenergyascomparedwithin-personalternatives,butasthedigital
Ifyouwanttoloseweight,butarenotafanofthegym,theresultsofanewstudycouldofferawelcomealternative.Peoplew
Ifyouwanttoloseweight,butarenotafanofthegym,theresultsofanewstudycouldofferawelcomealternative.Peoplew
We’vebeenhearingaboutitforyears,butthebooklesslibraryhasfinallyarrived,firstappearingoncollegecampuses.AtDre
We’vebeenhearingaboutitforyears,butthebooklesslibraryhasfinallyarrived,firstappearingoncollegecampuses.AtDre
随机试题
Boliviahasapopulationof【56】.Aboutone-tenthofthetotalpopulationiswhite;one-fourthare【57】Indiansandwhite;and
肠扭转:左心衰竭导致肺脏:
A.急性粒细胞白血病B.急性单核细胞白血病C.红白血病D.B细胞急淋白血病E.T细胞急淋白血病
物业服务企业一般不会对其所管辖建筑的窗户玻璃投保,而是承担了窗户玻璃偶尔损坏后的全部替换费用是控制风险的()手段。
于晓一家这几年陷入一种困境。于晓已经连续三年复读初三,她平时成绩都非常优秀,可总是在中考前夕提出要休学,否则就会提出自杀等可怕想法,甚至出现一些自残行为。于晓的父母都在外地打工,自从她上初三以来,母亲就一直陪读至今,父母一直为此事烦恼不已,求助于社会工作者
关于建设文化宣传橱窗的报告请示××××××:为全面推进我市文化宣传创新,进一步夯实基层基础工作,全面提升基层文化宣传水平,据2012年6月20日市政府会议纪要精神,为全市8个县(区)安装文化宣传橱窗各2块,每块5万元,采取市财政补一块,县(区)
阅读下列材料,回答问题。《中华人民共和国国民经济和社会发展第十三个五年规划纲要》指出,“十三五”时期是全面建成小康社会决胜阶段。必须认真贯彻党中央战略决策和部署,准确把握国内外发展环境和条件的深刻变化,积极适应把握引领经济发展新常态,全面推进创新发展
求幂级数n(n+1)xn的和函数.
在窗体上放置一个命令按钮Command1,并编写下列单击事件的程序:OptionBase1PrivateSubCommand1_Click()DimcAsInteger,dAsIntegerd=0
A、Heisheadofasmalltradingcompany.B、Heworksinaninternationalinsurancecompany.C、Heleadsateamofbrokersinabig
最新回复
(
0
)