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
45
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、Consequently
B、Briefly
C、Generally
D、Frankly
答案
A
解析
前面说市场潜力巨大,因此,这方面的研发活动迅速扩大,70年代初解决了一系列重大技术问题。这是一个因果关系,故选A Consequently。
转载请注明原文地址:https://kaotiyun.com/show/nmLd777K
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
Howmanydiseasesareknowntoattackwheat?WhichofthefollowingstatementsisNOTtrue?
Theindexisthegovernment’schiefgaugeoffutureeconomicactivity.
EarlyorLaterDayCareTheBritishpsychoanalystJohnBowlbymaintainsthatseparationfromtheparentsduringthesensitive
Theindexisthegovernment’schiefgauaeoffutureeconomicactivity.
A.ColorfulLifeonCampusB.IntelligentStudentBodyC.ExcellentAdministrationD.DistinguishedFacultyE.SubstantialFinancial
Initiallythewriterdidnotwanttobuyahearingaidbecause______.Manypeopleleavetheirheatingproblemuntreatedbecaus
SleepSleepispartofaperson’sdailyactivitycycle.Thereareseveraldifferentstagesofsleep,andtheytoooccurinc
Believeitornot,opticalillusion(错觉)cancuthighwaycrashes.Japanisacaseinpoint.Ithasreducedautomobilecrasheson
AHeroicWomanThewholeoftheUnitedStatescheereditslatesthero,AshleySmith,withtheFederalBureauofinvestigatio
WhatdoesProfessorLibbrechtbelievetobetrue?Itcanbefeltfromthedescriptioninthe2ndparagraphthattheauthor
随机试题
形成牙本质的结构是
一女青年,25岁,经婚前医学检查,发现患有乙型肝炎。医生提出的医学建议是
委托监理合同的有效期是指()。
某施工单位承接的二级公路中有四道单跨2.0m×2.0m钢筋混凝土盖板涵,在编制的《施工组织设计》中,对各涵洞的工序划分与工序的工作时间分析如下表所示。施工单位最初计划采用顺序作业法组织施工,报监理审批时,监理认为不满足工期要求,要求改为流水作
建设工程在保修期限内出现质量缺陷,由( )发出保修通知。
根据民事诉讼法律制度的规定,下列各项中属于经当事人申请不公开审理的案件的有()。
某纳税人委托加工一批化妆品,该化妆品的计税价格为()。
Methodsofstudyingvary:whatworks【C1】______forsomestudentsdoesn’tworkatallforothers.Theonlythingyoucandoisexp
下面的法律规定中,哪些不属于法的要素中的法律规则?()
Asthemerchantclassexpandedintheeighteenth-centuryNorthAmericancolonies,thesilver-smithandthecoppersmithbusiness
最新回复
(
0
)