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
66
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、conquered
B、cracked
C、resolved
D、determined
答案
C
解析
conquer意为“驾驭;征服”,crack意为“爆裂;撬开”,有惯用短语a hard nut to crack,意为“难题;难事;难对付的人”;resolve意为“找到解决……的方法(to find a solution to;solve)”;determine意为“决定;测定”。与issues构成动宾结构的应该是resolve。
转载请注明原文地址:https://kaotiyun.com/show/6mLd777K
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
InitiallythewriterdidnotwanttobuyahearingaidbecauseWhichofthefollowingisNOTtrueofCrystalEar?
TheproblemfacingBritishsurgeonsintheearly19thcenturywasthatThebodysnatchersusedwoodenshovelsbecause
NewU.S.PlanforDiseasePreventionUrgingAmericanstotakeresponsibilityfortheirhealth,HealthandHumanServicesSecr
WhatIsAnthrax?There’sbeenalotoftalkaboutanthraxonthenewslately.Somepeoplearewordedthatanthraxmaybeconn
Doctorsstronglyrecommendthatfathersshouldbepresentattheirbaby’sbirth.
Thetowerremainsintactevenaftertwohundredyears.
SugarPowerforCellPhonesUsingenzymescommonlyfoundinlivingcells,anewtypeoffuelcellproducessmallamountsofelec
Whenthecitywasburnedin1814,herescuedmanyofficialpapersfromthetownhall.
ASignificanceofTestingTechniquesforSamplingMicrobesintheDeepleeSheetBSpecialFeaturesofLakeVidaCLaterExpe
WhyTheyTravel?Scholarsandstudentshavealwaysbeengreattravellers.Theofficialcasefor“academicmobility”isnow
随机试题
论述中间商和制造商的区别。
国有经济在国民经济中的主导作用主要表现在()。
患者,男,61岁。高血压病史8年。冠心病史4年。近1周来胸骨后疼痛程度加重,次数增频,持续时间延长来门诊。测血压24.4/15.9kPa(184/120mmHg)。ECG示以R波为主的导联T波低平或倒置。心肌酶谱正常。为预防心肌梗死发生,下列处理哪项不正确
对于土方路基工程质量评定,以下说法正确的是()。
背景资料:某施工单位承接了一段二级公路普通水泥混凝土路面施工项目,合同段总长度36km,路面结构层为15cm厚级配碎石底基层、20cm厚水泥稳定碎石基层、24cm厚水泥混凝土面层,面层采用轨道摊铺机摊铺施工。钢材、水泥供应厂家由建设单位指定,施工
关于防水混凝土施工技术的说法,正确的有()。
下列关于商业信用的叙述中,正确的有()。
△ABC中,已知AB=20,AC=16,BC=12.以AB上的高CD为直径作一圆,圆与AC交于M,与BC交于N,则MN=[].
A、Itscolorisnotpopular.B、Itsstyleisfashionable.C、Itspriceisreasonable.D、Itssizeistoolarge.D由原文可知,这件衬衫是特大号的,太大了
Modernscientistsdividetheprocessofdyingintotwophases--clinicalortemporarydeathandbiologicaldeath.Clinicaldeath
最新回复
(
0
)