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
2013-02-27
64
问题
In the early 1950s the researchers who produced the first clad glass optical fibers were not thinking of using them for communications.【46】H______, fiber optics was already a well-established commercial technology when the famous paper by Kao and Hockham,【47】______ (claim) the use of low-loss optical fibers for communication, appeared in 1966. The first low-loss silica fiber was described in【48】______which appeared in October of 1970. The date of this publication is sometimes【49】______(cite) as the beginning of the era of fiber communication. Although this development did receive【50】______ (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【51】 wh______these fiber components could ever be produced economically enough, but the market potential was very significant.【52】______(consequence) , research and development activity expanded rapidly, and a number of important issues were【53】re______during the early 1970s. During the middle and late 1970s, the rate of progress towards marketable products accelerated as the emphasis【54】______(shift) from research to engineering. Fibers with losses【55】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.
选项
答案
whether
解析
此句可译为:该技术障碍似乎难以逾越,因为人们十分怀疑这些纤维构件是否可以以足够低的成本生产出来,‘但是市场潜力是十分巨大的。
转载请注明原文地址:https://kaotiyun.com/show/XgVK777K
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
MostChinesepeoplewenttoworkbybikewithinliving________.
Thecriminaljusticesystemneeds________reformtopreventmorepeoplefrombeingwrongfullyimprisoned.
Heistooshytoaskastrangerthetime,________speaktoaroomfullofpeople.
A、Itmakespeopleunhealthy.B、Itmakespeopledepressed.C、Itbringspeoplemorework.D、Itmakestheworkcomplicated.C由原文可知,
Americans’PersonalityAmericansusuallyconsiderthemselvesafriendlypeople.
A、Itisnotallowedtodresscasually.B、Mostpeoplewearsuitsandties.C、Itisnotpropertowearatietowork.D、Fewpeople
CriticalThinkingandInnovativeWritingThetraditionalwayofteaching.studentsareurgedto【T1】________things.
CriticalThinkingandInnovativeWritingThetraditionalwayofteaching.studentsareurgedto【T1】________things.
随机试题
A、Itisadiplomaticorganization.B、ItisanillegalorganizationC、ItisanenvironmentalprotectionorganizatioaD、Itisape
杨某持有甲有限责任公司10%的股权,该公司未设立董事会和监事会。杨某发现公司执行董事何某(持有该公司90%股权)将公司产品低价出售给其妻开办的公司,遂书面向公司监事姜某反映。姜某出于私情未予过问。杨某应当如何保护公司和自己的合法利益?()
证券公司股东虚假出资的,国务院证券监督管理机构无权采取下列哪种措施?()
个人汽车贷款中,为防范信用风险,可对符合条件的、资金周转存在周期性的客户采用按月还息、按计划表还本的还款方式,但借款人必须在贷款发放后的第()个月开始偿还首笔贷款本金。
董某从某汽车经销公司购买了一辆货车,后董某驾驶汽车运载超重货物上路行驶,由于钢圈破碎导致翻车,造成董某人身及财产损害若干;经交通事故处理部门认定汽车质量不合格是导致事故的主要原因,但董某超重行驶也是造成事故的原因之一。根据合同法律制度的规定,有关本案的下列
_______newbuildingswillbebuiltinmyhometown.
根据下图回答126-130题注:图中三个圆的半径分别为100、200和300万元。分析上图,可以得出:1985年期间,最有可能因偶然因素而影响了销售额变化的月份是:
社会主义经济体制是指()。
Thecaseforcollegehasbeenacceptedwithoutquestionformorethanageneration.Allhighschoolgraduatesoughttogosaysc
Thisspaciousroomis______furnishedwithjustafewarticlesinit.
最新回复
(
0
)