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
2021-03-10
58
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 0.8μm were produced.
By 1980 improvement in component performance, cost, and reliability led to major commitments on the part of telephone companies.
【C6】
选项
答案
whether
解析
空格处句子的意思是: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/kmAK777K
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
TheCambridgeUnionSociety,commonly【C1】______(refer)tosimplyastheCambridgeUnion,isthelargeststudentsocietyatthe
TheLondontoBrightonCarRunThefirstLondontoBrightonruntookplaceonNovember14th,1896.Itwas【21】org______tocel
ThroughEnglishwewillbeabletocommunicate______partoftheworldwecomefrom.
ThefollowingnewsitemiscorrectEXCEPT___________.
What’stherealreasonfortheman’ssymptoms?
FireswerecommoninLondoninthe17thcentury.Mostbuildingsweremadefromwood【M1】_______andwereveryclosetogether,so
Helen:Hey,______Nigel:Ididn’tknowyou’dappliedforone.Helen:Yes.Ihadaninterviewlastweekandtheywantme.
—We’reallgoingtotheNewSkylineRestaurantforourend-of-yearget-together.Canwecountyouin?—Oh,thanks,Sara,but_
Toronto,Canada,islocatedontheshoreofLakeOntario,withdirectflighttomostmajorworldcities.Itisamulticulturalc
Diamondisthehardestnaturallyoccurringsubstanceknown.Itisthemostpopulargemstoneandbecauseofitsextreme【C1】_____
随机试题
行政机关行使行政裁量权应当符合立法目的,采取的措施和手段应当必要、适当;实施行政管理可以采取多种方式实现行政目的,应当选择最有利于保护公民、法人和其他组织合法权益的方式。()
简述会计科目的设计原则。
In1848asettlerinremote,undevelopedCaliforniadiscoveredgoldnearSacramento.Asthenewsspread,agreattideofgold-
经尿道前列腺电切术后,尿道放置三腔气囊导尿管的主要目的是()。
A.严谨求实,奋发进取B.尊重病人,一视同仁C.文明礼貌,关心体贴D.谨言慎行,保守医密E.互学互尊,团结协作关于医务人员相互之间的医德规范是
下列关于编制国民经济和社会发展规划应遵循的一般原则的说法中,正确的是()。
在登记会计账簿时,如果发生隔页、跳行,应当()。
下列哪一项关于学校社会工作者的陈述是最准确的?()
桌子上放着9只杯子,其中有5只杯口朝下,4只杯口朝上,每个人可任意将杯子翻动5次,要将9只杯子全变成杯口朝下,至少需要()个人。
某市规定,出租车合乘部分的车费向每位乘客收取显示费用的60%,燃油附加费由合乘客人平摊。现有从同一地方出发的三位客人合乘,分别在D、E、F点下车,显示的费用分别为10元、20元、40元。那么在这样的合乘中,司机的营利比正常(三位客人是一起的,只是分别在上述
最新回复
(
0
)