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
One of the most important technological developments during the 1980s has been the emergence of optical fiber communication as a
One of the most important technological developments during the 1980s has been the emergence of optical fiber communication as a
admin
2009-06-15
78
问题
One of the most important technological developments during the 1980s has been the emergence of optical fiber communication as a major international industry. One indication of the(51)of this development is the total(52)of installed fiber, which was estimated to be 3.2 million kilometers in the U.S. alone by the end of 1987. Over 90% of this fiber was placed.(53)during the time period of 1982—1987. Long-haul trunk installations(长途干线设施) have dominated,(54)for about 95% of the fiber in the U.S.
In the early 1950s the researchers who produced the first clad glass optical fibers were not (55)of using them. for communications. (56), fiber optics was already a well-established commercial technology when the famous paper by Kao and Hockham,(57)the use of low-loss optical fibers for communication, appeared in 1966.
The first low-loss silica fiber was described in a publication which appeared in October of 1970. The date of this publication is sometimes(58)as the beginning of the era of fiber communication. Although this development did receive(59)attention in the research community at- the time, it was far from inevitable that a major industry would evolve.
The technological barriers appeared(60)because there were serious doubts as to(61)these fiber components could ever be produced economically enough, but the market potential was very significant. (62), research and development activity expanded rapidly, and a number of important issues were(63)during the early 1970s. During the middle and late 1970s, the rate of progress towards marketable products accelerated as the emphasis(64)from research to engineering. Fibers with losses approaching the Payleigh limit of 2 dB/km at a wavelength of 0.8um were produced.
By 1980 improvement in component performance, cost, and reliability led to major commitments (65)the part of telephone companies.
选项
A、imagining
B、thinking
C、considering
D、prospecting
答案
B
解析
惯用短语not think of using…for意为“没有考虑将(光纤)应用到(通信)中”。
转载请注明原文地址:https://kaotiyun.com/show/LmLd777K
本试题收录于:
职称英语理工类A级题库职称英语分类
0
职称英语理工类A级
职称英语
相关试题推荐
Theword"mirror"inthefirstlinecouldbebestreplacedbyWhichofthefollowingstatementsisNOTtrueofBruceHardy?
A.OuncesofwaterneededperdayB.ImportanceofwaterC.CompositionofwaterD.SignsofdehydrationE.SupplyofwaterF.Necessi
Menofacertainagearealwaysreadytotalkabouttheirfatproblem.Theex-husbandsarepitifulbecausetheyhavegotnowiv
WhatIsAnthrax?There’sbeenalotoftalkaboutanthraxonthenewslately.Somepeoplearewordedthatanthraxmaybeconn
Howmanydiseasesareknowntoattackwheat?WhichofthefollowingstatementsisNOTtrue?
DiseasesofAgriculturalPlantsPlants,likeanimals,aresubjecttodiseasesofvariouskinds.Ithasbeenestimatedthatso
Initiallythewriterdidnotwanttobuyahearingaidbecause______.OnespecialfeatureofCrystalEaristhat______.
Mt.DesertIslandThecoastoftheStateofMaineisoneofthemostirregularintheworld.Astraightlinerunningfromth
Thereporterwasaccusedofunprofessionalconduct.
TheboatsoftheearliestvoyagerstotheNorthAmericancontinentwereexceptionallywellbuilt.
随机试题
根据下列统计资料回答问题。 2020年末S省就业人口4750.9万人,占常住人口总数的59.01%,与2019年末相比。就业人口占常住人口总数的比重下降0.24个百分点。2020年末S省第一产业、第二产业和第三产业的就业人口数量分别为764.89万人、2
铁路运输的特点是()。
下列关于绩效评估的说法不正确的是()
低钾血症最早的临床表现有
龈下刮治放入器械时,工作端平面与牙根面之间的最佳角度是
一患者体重60kg,临床表现为较严重的代谢性酸中毒,未测二氧化碳结合力时,可先补充5%碳酸氢钠溶液( )
下列行为属于信用证欺诈的有:()。
()是最基础、最简单的一种系统安全分析方法。
利润表的组成部分包括()。Ⅰ.营业收入Ⅱ.所有者权益Ⅲ.与营业收入相关的生产性费川、销售费用和其他费用Ⅳ.利润
2011年6月20日,云南红河州中级人民法院依法公开审理43名被告人涉黑犯罪案件,并作出判决。法院公开审理涉黑犯罪案件说明()。
最新回复
(
0
)