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
44
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、accounting
B、taking up
C、amounting
D、adding up
答案
A
解析
此句可译为:在美国,长途干线设施占主导地位,约占光纤总长的95%。account for意为“解释;占去”,amount to意为“总数为……”,add up to意为“总计共达;(总起来看)等于说”。
转载请注明原文地址:https://kaotiyun.com/show/GmLd777K
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
InitiallythewriterdidnotwanttobuyahearingaidbecauseManypeopleleavetheirhearingproblemuntreatedbecause
GlucosecannotbeturnedintoenergyinthebodyTheworsteyedamageinducedbydiabetesis
ThereasonsgivenbelowaboutthepopularityofE-mailcanbefoundinthepassageexcept______Whatdoesthesentence"Ifiti
SincetheGreatDepression,theUnitedStatesgovernmenthasprotectedfarmersfromdamagingdropsingrainprices.
Mt.DesertIslandThecoastoftheStateofMaineisoneofthemostirregularintheworld.Astraightlinerunningfromth
Mt.DesertIslandThecoastoftheStateofMaineisoneofthemostirregularintheworld.Astraightlinerunningfromth
DreamsEveryonecandream.Indeed,everyonedoesdream.Thosewho【C1】______thattheyneverdreamatallactuallydream【C2】__
CurrenthiringpoliciesintheUnitedStatesseektoprovideequalemploymentopportunitiesforwomenandminoritygroups.
Youdon’tneedtocarrylargeamountsofcash;actuallyallfinancialbusinesseswillbeconductedbycomputers.
Nowadaysmanyscientistsdependonradiocarbonfordatingage-oldobjects.Thehalf-lifeofC-14isabout25,000years.
随机试题
下列关于文学作品内容的理解,不正确的一项是()
常见的电子商务模式有________、___________和________3种。
ModernAmericanmusicisrichinitsvarietyofforms,styles,andinstruments.Acompleteencyclopedia(百科全书)ofAmericanmusic
男性,36岁。间断腰背部疼痛10余年,以夜间及晨起明显,活动后可减轻,近1年出现脊柱活动受限,未系统诊治。查体:腰椎活动受限,颈椎活动受限,指地试验阳性,双侧“4”字试验阳性。提问l:该患者最可能的诊断是A.反应性关节炎B.强直性脊柱炎
增值税的应税范围包括()。
关于土地使用权转让,下列说法有误的是()。
王某本月将A商标权的使用权许可甲公司使用,取得收入3800元;将B技术使用权许可乙公司使用,取得收入6000元。已知特许权使用费所得适用的个人所得税税率为20%,根据个人所得税法律制度的规定,王某本月应缴纳个人所得税()元。
(2015·广西)教师组织课外活动()
在历史学科中,抗日战争史是最受社会广泛关注的领域之一。近期,教育部要求各级各类教材全面落实“十四年抗战”概念,并修改相关内容,确立“十四年抗战”的意义是()。(常考)
Sleepdeprivationisaknowncauseofworkplaceerror,andmanyphysiciansfrequentlygowithoutsleepforperiodsof24hourso
最新回复
(
0
)