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
2016-01-14
59
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.
【C4】
选项
答案
cited
解析
此处为被动语态。句意为:这篇文章发表的日期经常被人们称为光纤通讯时代的起始日。
转载请注明原文地址:https://kaotiyun.com/show/w6NK777K
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
(1)TheUnitedStatesisfacingitsfirstmajorteachershortagesincethe1990s,onethatcoulddevelopintoacrisisforschoo
(1)Executivecoachingisprimarilyconcernedwithconfidentialone-to-onediscussionsbetweenthecoachandtheexecutive.Iti
PassageFiveWhat’stheauthor’sopinionabouteatingfruitinthelastparagraph?
ThearchitectoftheWalkieTalkiebuildinginLondonhasadmittedthathepredicteditmightreflecthotsunraystothestreet
Formanyolderpeople,themodernworldislikeaforeigncountry;telephonestheycan’tuse;videomachinestheycan’tprogramm
花一周时间参加这样的会议将会是浪费时间。(awasteof)
Cricket,themosttypicalEnglishsport,hasbeen______sincethe16thcentury.
Thehomeof______isScotlandwherethegamehasbeenplayedsincethe17thcentury.
ThespeakersaretalkingaboutNorwoodUniversityonthephone.
Manydoctorsknowthestoryof’MrWright’.In1957hewasdiagnosedwithcancer,andgivenonlydaystolive.Hehadtumourst
随机试题
A.Ⅲ型超敏反应B.Ⅳ型超敏反应C.二者均有D.二者均无
前列腺素衍生物Latanoprost(适利达)的降眼压机制是()
关于某洁净室有以下数据:为保证空气洁净度等级的送风量为12000m3/h,根据热、湿负荷计算确定的送风量为10000m3/h,补偿室内排风量和保持室内正压值所需新鲜空气量之和为14000m3/h,保证供给洁净室内人员的新鲜空气量为7000m3/h,则洁净室
东部地区要继续发挥经济特区、上海浦东新区的作用,推进()开发开放,支持海峡西岸和其他台商投资相对集中地区的经济发展,带动区域经济发展。
任何单位,对账工作每年至少进行一次。()
()是通过开展对违反会计职业道德行为和对违法会计行为典型案例的讨论和剖析,给会计人员以启发和警示,从而可以提高会计人员的法律意识和会计职业道德观念,提高会计人员辨别是非的能力。
在连续竞价中,若新进入的一个买卖委托能成交,其成交价取卖方叫价。()
一般来讲,公积金个人住房贷款的发放方式是()。
下列各项中,应当征收资源税的有()。
法律通过对权利、义务的规定,告诉人们该怎样行为、不该怎样行为以及必须怎样行为。这一表述指的是法的那一项基本特征?
最新回复
(
0
)