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
35
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.
【C17】
选项
A、functional
B、noticeable
C、transparent
D、conspicuous
答案
A
解析
空格前的and yet“然而”提示即便是灯泡亮度达到人眼看不到的程度,还是可以正常工作。A项functional“发挥功能的”符合语义逻辑。B项noticeable“可注意到的”和D项conspicuous“明显的”与not visible相矛盾。C 项transparent“透明的”代入后指不可见但仍是透明的,语义逻辑不对。
转载请注明原文地址:https://kaotiyun.com/show/MtMD777K
0
考研英语二
相关试题推荐
Peoplegenerallyassumethatwhentheyconsideranotherpersona"friend,"thatpersonalsothinksofthemasafriend,whichme
Aphrasethatfirstbecamefashionableadecadeagoiseverywhere."Bringyourwholeself"isoneoffourvaluesthatBritishLa
Inanew【C1】________publishedinthejournalHeart,researchersfoundthatSwissadultswhotookoneortwodaytimenapsperwee
Inanew【C1】________publishedinthejournalHeart,researchersfoundthatSwissadultswhotookoneortwodaytimenapsperwee
Li-Fi,analternativetoWi-Fithattransmitsdatausingthespectrumofvisiblelight,hasachievedanewbreakthrough,withUK
Li-Fi,analternativetoWi-Fithattransmitsdatausingthespectrumofvisiblelight,hasachievedanewbreakthrough,withUK
Li-Fi,analternativetoWi-Fithattransmitsdatausingthespectrumofvisiblelight,hasachievedanewbreakthrough,withUK
Li-Fi,analternativetoWi-Fithattransmitsdatausingthespectrumofvisiblelight,hasachievedanewbreakthrough,withUK
Forgetmilkydrinks,hotwaterbottlesorcurlingupwithagoodbook.Therealsecrettoagoodnight’ssleepmaybewhereyou
Forgetmilkydrinks,hotwaterbottlesorcurlingupwithagoodbook.Therealsecrettoagoodnight’ssleepmaybewhereyou
随机试题
贫血和一氧化碳中毒时,可携带氧的血红蛋白都减少,但并不引起呼吸加强。这是因为
肝脾实质表现为
男性,30岁。头晕,头痛来诊,血压180/100mmHg,上腹部可闻及血管杂音。首先考虑的诊断为
生后24小时内出现黄疸者,应首先考虑
对期货公司高级管理人员进行自律管理的机构有( )。
向不特定对象发行的证券票面总值超过人民币()元的,应当由承销团承销。
()是指为了使家庭财产及其产生的收益在家庭成员之间实现合理的分配而做的财务规划。
Atabasiclevel,cloudcomputingissimplyameansofdeliveringITresourcesas(1).AlmostallITresourcescanbedeliv
有如下程序段:intx=12:doubley=3.141593;printf("%d%8.6f",x,y);其输出结果是()。
Completethenotesbelow.WriteNOMORETHANTWOWORDSforeachanswer.AdvertisingEffectTheimportantfactortoconsider
最新回复
(
0
)