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
2023-02-24
22
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 lOGbitfe—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.
【C19】
选项
A、plots
B、scenarios
C、places
D、settings
答案
B
解析
上文提到Li-Fi的缺点,本句说明缺点有时也可以变为优点。B项scenarios表示“方案;情节;剧本”,in some scenarios是固定搭配,表示“在某些情况下”。A项plots虽然可以表示“情节”,但是无in some plots的搭配。C项places“地方”,而上下文的语境并不涉及具体的场所。D项settings指小说、戏剧等的场景。
转载请注明原文地址:https://kaotiyun.com/show/rtMD777K
0
考研英语二
相关试题推荐
Skepticsofhighereducationoftencomplainthatuniversitiesoffertoomanyboringdegreeswithlittlevalueintheworkplace.【
Skepticsofhighereducationoftencomplainthatuniversitiesoffertoomanyboringdegreeswithlittlevalueintheworkplace.【
Overthecourseofmanyyears,withoutmakinganygreatfussaboutit,theauthoritiesinNewYorkdisabledmostofthecontrol
AdecadeagobiologistsidentifiedaremoteprotectedareainnorthernLaos,calledNamEt-PhouLouey,asthecountry’sprobable
AdecadeagobiologistsidentifiedaremoteprotectedareainnorthernLaos,calledNamEt-PhouLouey,asthecountry’sprobable
Inanew【C1】________publishedinthejournalHeart,researchersfoundthatSwissadultswhotookoneortwodaytimenapsperwee
Inanew【C1】________publishedinthejournalHeart,researchersfoundthatSwissadultswhotookoneortwodaytimenapsperwee
AndyWarholputitbest."YoucanbewatchingTVandseeCoca-Cola,andyouknowthatthePresidentdrinksCoke,andjustthink,
Li-Fi,analternativetoWi-Fithattransmitsdatausingthespectrumofvisiblelight,hasachievedanewbreakthrough,withUK
随机试题
何谓突发性故障?何谓渐发性故障?
M公司有关债券投资业务如下:(1)2013年1月1日,M公司从活跃市场购买了N公司一项债券,期限5年,债券面值2200万元,公允价值为1922万元(含交易费用20万元),2012年1月5日按票面利率3%支付利息。该债券在第5年兑付本金及最后一期利息。实际
导游服务质量低,则不会对旅游产品的销售起到扩散作用。()
()是我国教育制度的基础,是决定我国教育发展的根本法。
经典之所以为经典。就是因为它不但历久弥新,而且常读常新。常言道,“读书百遍其义自见”,苏轼也说“故书不厌百回读,熟读深思子自知”。经典之书,不同年龄读有不同年龄的体会,不同境遇读有不同境遇的领悟。小时候背诵经典,可能还不能领会其中要旨,但是背熟了,就成为一
关于非涉密政务办公网,下列说法错误的是()。
下列关于接入技术特征的描述中,正确的是()。
关系表中的每一横行称为一个______。
A、 B、 C、 B
Forthefirstthreemonthsofthisyeargarmentsalesvolumeincreasedfrom100000dozenspermonthto300000dozenspermonth.B
最新回复
(
0
)