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
28
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、Furthermore
B、Accordingly
C、However
D、Otherwise
答案
C
解析
此句可译为:50年代初期,那些生产出第一批被覆层玻璃光纤的研究者们尚未考虑将光纤应用到通信中。然而,当1966年Kao和Hockham发表著名论文,提出把低耗光纤应用于通讯中时,纤维光学已经成为一个相当成熟的商业技术了。从译文看,前一句与后一句之间的逻辑关系是转折,故选用However。
转载请注明原文地址:https://kaotiyun.com/show/QmLd777K
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
ASpecialClockEverylivingthinghaswhatscientistscallabiologicalclockthatcontrolsbehavior.Thebiologicalclock(5
ASpecialClockEverylivingthinghaswhatscientistscallabiologicalclockthatcontrolsbehavior.Thebiologicalclock(5
AKeepingGoodRelationswithLocalBusinessmenBServiceProvidedbyLocalNewspapersCLargeCirculationoftheNationalNe
WhatIsAnthrax?There’sbeenalotoftalkaboutanthraxonthenewslately.Somepeoplearewordedthatanthraxmaybeconn
Accordingtothepassage,theattempttoeradicatetheAIDSvirusOtherscientistsarelookingatexperimentsthataresimilar
AWondersMadebyOurSickbutCharmingLittleGirlBHelpingaDoctortoSucceedCHeartsSaddenedbyaRareDisorderofOur
ThereasonsgivenbelowaboutthepopularityofE-mailcanbefoundinthepassageexcept______Whatdoesthesentence"Ifiti
WhyDoManyFemaleAthletesFallVictimtoKneeInjuries?RebeccaLobo,abasketballstar,grabbedareboundduringthefirst
MyLifeatRendaIlearnedveryquicklythatbeingateachingassistant(TA)attheUniversityofIowawouldbedifferentfro
TheboatsoftheearliestvoyagerstotheNorthAmericancontinentwereexceptionallywellbuilt.
随机试题
垄断利润的主要来源()
主湿证的脉象有
黑白花奶牛,3岁,采食后突然发病。反刍停止,喜卧,呻吟,磨牙,排便量减少,精神沉郁,腹部膨胀,左欣窝扁平,听诊瘤胃蠕动音消失。对本病有诊断意义的瘤胃内容物呈()
以下表现与格林-巴利综合征无关的是
[2005年第19题]设A=,其中ai≠0,bj≠0(i=1,2,…,n),则矩阵A的秩等于()。
“进口口岸”栏应填报()。9.“成交方式”栏应填报()。
根据以下资料.回答下列问题。2011年1—8月份,全国规模以上工业企业实现利润32281亿元,同比增长28.2%。在规模以上工业企业中,国有及国有控股企业实现利润10175亿元,同比增长20.6%;集体企业实现利润519亿元,同比增长3
在下列一首七律的横线处填上一句最贴切的句子,正确的一项是()。江风送月海门东,人到江心月正中。______________,一船鸡犬欲腾空。帆如云气吹将灭,灯近银河色不红。如此宵征信奇绝,三更三点水精宫。
计算机系统软件中,最基本、最核心的软件是()。
A、It’swindy.B、It’scloudy.C、It’srainy.D、It’sshiny.D事实细节题。对于Albuquerque的天气,女士提到了Fineweather,显然应该是阳光明媚才对。
最新回复
(
0
)