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
2019-05-03
51
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.
【C9】
选项
答案
shifted
解析
shift指位置或方向的移动、改变;指由一种形式或用途改变为另一种形式或用途。
转载请注明原文地址:https://kaotiyun.com/show/GYNK777K
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
IhaveanurgentproblemandIneedtocallmyparents,butI’mafraidIhaven’tgot______change—onlya£10note.Willyoudo
PaparazziTheterm"paparazzi"comesfromacharactercalledPaparazzointhefilm,LaDolceVita,whorodearoundonamoto
YouandafriendrecentlyspentafewdaysinLondon,aspartofatouringholiday.Whileyouwerethereyoubothwantedtosee
Thetermcultureshockwasintroducedforthefirsttimein1958todescribethe【D1】______producedwhenapersonmovestoaco
Thetermcultureshockwasintroducedforthefirsttimein1958todescribethe【D1】______producedwhenapersonmovestoaco
Whydoesn’tMarklikeLondon?
WhatisNewYorkfamousfor?
A、Howtomakeaspeech.B、Howtobeagoodlistener.C、Agoodtopicfordiscussion.D、Theproblemsincommunicating.D男士一开始便问道,交
Youareseekingafeelingofwell-beingand"oneness"withthecar.Don’tletanybody,carexpertornot,tellyouwhichcarsu
随机试题
论述审美经验的动态过程。
治疗胸胁停饮所致的喘咳宜选用的药物是
病毒感染早期检测到特异性的抗体IgM,下列描述中对其解释不正确的是
[2009年第39题,2007年第48题]《公共建筑节能设计标准》(GB50189─2015)限制外墙上透明部分应不超过该外墙总面积的70%,其主要原因是:
项目建设单位开展前期工作时要提出用地预审申请,由()依法对建设项目用地进行审查。
某封闭式基金的市场价格为1.800元,基金份额净值为2.000元,那么此封闭式基金的折(溢)价率为()。
甲酒厂欲从乙粮库购买一千吨高粱,业务员因为疏忽在买卖合同中未写明高梁质量。关于该合同,下列哪些说法是正确的?
商品:是用来交换的劳动产品。根据这一含义,下列情况属于商品的是( )。
8位大学生打算合资创业,在筹资阶段,有2名同学决定考研而退出,使得剩余同学每人需要再多筹资1万元;等到去注册时,又有2名同学因找到合适工作而退出,那么剩下的同学每人又得再多筹资几万元?
已知某高速缓存(Cache采用组相联映像方式,即组问直接映像,组内全相联映像。假设主存容量为4096块,每块256字节,高速缓存包含32块,分8组,每组4块。高速缓存的地址变换表应包含(1)个存储单元;每个存储单元应能存放(2)位二进制数;每次参与相联比较
最新回复
(
0
)