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
25
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.
【C7】
选项
A、by
B、with
C、upon
D、over
答案
D
解析
此空格需要填入一个能与电磁波谱搭配的介词构成方式状语。D项over表示“通过……媒介”,代入句中表示“Wi -Fi和Li-Fi都是通过电磁波谱来传输数据”。A项by表示采用某种方式或手段,后面的名词一律不用定冠词the。B项with表示使用有形的工具,例如第三段transmit Li-Fi sigils with a single microchip表示“用一个微芯片来传输Li-Fi信号”,而the electromagnetic为无形之物。C项upon与over都可以表示“在……之上”,但是不能表示“通过”。
转载请注明原文地址:https://kaotiyun.com/show/atMD777K
0
考研英语二
相关试题推荐
YouareagraduatingstudentofBeijingUniversity,andyouareinterestedinthepositionofsalesmanagerofferedbyacompany
Skepticsofhighereducationoftencomplainthatuniversitiesoffertoomanyboringdegreeswithlittlevalueintheworkplace.【
Overthecourseofmanyyears,withoutmakinganygreatfussaboutit,theauthoritiesinNewYorkdisabledmostofthecontrol
SupposeyouareamemberoftheStudents’Unionandyouruniversitywillholdanexperiencesharingmeetingaboutthepostgradua
AndyWarholputitbest."YoucanbewatchingTVandseeCoca-Cola,andyouknowthatthePresidentdrinksCoke,andjustthink,
AndyWarholputitbest."YoucanbewatchingTVandseeCoca-Cola,andyouknowthatthePresidentdrinksCoke,andjustthink,
Li-Fi,analternativetoWi-Fithattransmitsdatausingthespectrumofvisiblelight,hasachievedanewbreakthrough,withUK
Li-Fi,analternativetoWi-Fithattransmitsdatausingthespectrumofvisiblelight,hasachievedanewbreakthrough,withUK
Li-Fi,analternativetoWi-Fithattransmitsdatausingthespectrumofvisiblelight,hasachievedanewbreakthrough,withUK
Forgetmilkydrinks,hotwaterbottlesorcurlingupwithagoodbook.Therealsecrettoagoodnight’ssleepmaybewhereyou
随机试题
现有4个用户需要某种货物,坐标分别为:A(1,4),B(2,一5),C(一3,1),D(一2,一3),需求量分别为10吨、15吨、8吨、12吨。请选择物流中心,使总运费量最小。
有机磷杀虫药中毒引起中枢神经系统症状不包括
侧腭突来源于
强心苷用于治疗慢性心功能不全时,疗效最好的是
在集装箱运输中,货物从发货人的工厂或仓库装箱后,可经由海陆空不同运输方式一直运至收货人的工厂或仓库,中途无须开箱倒载和检验。()
银行个人理财业务人员的下列做法正确的是()。
A公司有关甲产品原材料消耗及工时消耗情况如:假定:甲产品消耗原材料单价12元,小时工资率10元,小时费用率8元。要求:(1)按定额比例法分配计算甲产品完工产品和月末在产品成本。(2)并编制完工产品入库的会计分录。
现代边缘派诗歌代表作《奇怪的接近》中写道:“咖啡的颜色接近于黑啤,黑啤的颜色接近于咖啡……我必须要放弃其中之一。我留下了黑啤,尽管它似乎不如咖啡高贵……”如果我们把诗歌中的语句看做表达了一种判断形式的话,以下选项中判断形式与之不同的是:
关于宪法解释体制的表述,下列表述正确的是()
Doctorssayangercanbeanextremelydamagingemotionunlessyoulearnhowtodealwithit.Theywarnthatangryfeelingscan【
最新回复
(
0
)