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
外语
In the early 1950s the researchers who produced the first clad glass optical fibers were not thinking of using them for communic
In the early 1950s the researchers who produced the first clad glass optical fibers were not thinking of using them for communic
admin
2016-12-08
38
问题
In the early 1950s the researchers who produced the first clad glass optical fibers were not thinking of using them for communications.【C1】H______, fiber optics was already a well-established commercial technology when the famous paper by Kao and Hockham,【C2】______ (claim)the use of low-loss optical fibers for communication, appeared in 1966. The first low-loss silica fiber was described in【C3】______which appeared in October of 1970. The date of this publication is sometimes【C4】______(cite)as the beginning of the era of fiber communication. Although this development did receive【C5】______(consider)attention in the research community at the time, it was far from inevitable that a major industry would evolve.
The technological barriers appeared formidable because there were serious doubts as to 【C6】wh______these fiber components could ever be produced economically enough, but the market potential was very significant.【C7】______(consequence), research and development activity expanded rapidly, and a number of important issues were【C8】re______during the early 1970s. During the middle and late 1970s, the rate of progress towards marketable products accelerated as the emphasis【C9】______(shift)from research to engineering. Fibers with losses【C10】 app______the Rayleigh limit of 2 dB/km at a wavelength of 0. 8 μm were produced.
By 1980 improvement in component performance, cost, and reliability led to major commitments on the part of telephone companies.
【C10】
选项
答案
approaching
解析
approaching the Rayleigh limit接近瑞利极限。
转载请注明原文地址:https://kaotiyun.com/show/HQNK777K
本试题收录于:
C类竞赛(非英语专业本科)题库大学生英语竞赛(NECCS)分类
0
C类竞赛(非英语专业本科)
大学生英语竞赛(NECCS)
相关试题推荐
In1885,theU.S.PostOfficehadaprobleminthesouthernstateofFlorida.Thedeliveryservicef【21】LakeWorthtoBiscayen
Whatdoyouknowaboutthehistoryofyourfamily?Tracingyour【16】anc______canbeaveryinterestinghobby.But,ifyougoabou
______herphonenumber,wehadsomedifficulty______her.
Aknowledgeofdifferencesbetweenculturesinanever-shrinkingglobalizedworldarebecomingoneoftheessentialskillsthat
Anyonecanborrowbooksfromthelibrary______hekeepsthemcleanandreturnsthenontime.
Changesinthewaypeoplelivebringaboutchangesinthejobsthattheydo.Moreandmorepeopleliveintownsandcitiesinste
Childrenareinventinganewlexiconforelectroniccommunicationwitharangeofjargonandsymbolsthatadultsfindhardtou
AnoldfriendofminefromBeijing,______Iwasexpectingtomeet,rangmeupfromthebusstationyesterdayevening.
A、Awriter.B、Ateacher.C、Areporter.C
Ifitweretwohourslater,itwouldbehalfaslonguntilmidnightasitwouldbeifitwereanhourlater.Whattimeisitnow
随机试题
用于预防应激性溃疡的上消化道出血及麻醉前给药预防吸入性肺炎的药物是
推理的形式有效性是指对于一个推理形式假设______,则_______。
导致脉道不利的原因是
男,50岁。上腹部隐痛2年,间歇性黑便,体重下降,近3个月出现疼痛向腰背部放射。查体:贫血貌,上腹部可触及一4cm×3cm肿块,固定。此患者最可能的诊断是
以下关于围护结构的传热热阻,说法不正确的是()。
()能自动核销已对账的记录。
对借款人的限制包括()。
如果要在Applet中显示特定的文字、图形等信息,可以在用户定义的Applet类中重写的方法是
下列循环语句中有语法错误的是()。
Lookatthechartsbelow.TheyshowthesalesoftelephonesindifferentdepartmentstoresfromMondaytoWednesday.Whichchart
最新回复
(
0
)