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
2018-01-27
60
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/SXNK777K
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
ThroughEnglishwewillbeabletocommunicate______partoftheworldwecomefrom.
Childrenareinventinganewlexiconforelectroniccommunicationwitharangeofjargonandsymbolsthatadultsfindhardtou
Childrenareinventinganewlexiconforelectroniccommunicationwitharangeofjargonandsymbolsthatadultsfindhardtou
Childrenareinventinganewlexiconforelectroniccommunicationwitharangeofjargonandsymbolsthatadultsfindhardtou
Childrenareinventinganewlexiconforelectroniccommunicationwitharangeofjargonandsymbolsthatadultsfindhardtou
Childrenareinventinganewlexiconforelectroniccommunicationwitharangeofjargonandsymbolsthatadultsfindhardtou
Hawaiitypically______whenyouarethinkingofaholiday,butitisalsoagoodexampleofdiversityandharmonyintheUnitedS
Thetermcultureshockwasintroducedforthefirsttimein1958todescribethe【D1】______producedwhenapersonmovestoaco
Thetermcultureshockwasintroducedforthefirsttimein1958todescribethe【D1】______producedwhenapersonmovestoaco
随机试题
女,50岁。因子宫肌瘤行全子宫切防术。术中医生发现患者左侧卵巢有病变应切除,在未征得患者及其家属同意的情况下,将左侧卵巢与子宫一并切除。术后患者恢复良好。该案例中,医生违背的临床诊疗伦理原则是
对于含有聚山梨酯的药物,其防腐能力不会受到破坏的是
某运营商新建光缆线路工程初步设计已完成,工程估算价为2500万元,通过招标确定了一家施工单位,并委托一家监理单位对本工程实施监理。中标施工单位做好了充分准备,在收到开工令后,工程顺利开工。本工程直埋部分与一条地下自来水管交越,部分路段采用立杆架空敷设;工
2003年2月,张某按市场价格出租个人所有的居民住房,取得租金收入500元,则其应纳的房产税税额为20元。()
乘坐火车过程中,导游要注意()。
Inwriting,______willgivestudentstheopportunitytoselectfromthelistthoseusefulideastobeincludedintheirwriting
《种子法》规定,种子贮备的具体办法由()规定。
若用SQL命令检索所有比“刘宁”基本工资多的职工记录,下列语句正确的是()。
以下关于删除表中记录的描述,正确的是( )。
有以下程序voidfun(double*p1,double*p2,double*s){s=(double*)calloc(1,sizeof(double));*s=*p1+*(p2+1);)
最新回复
(
0
)