2. 外语
  3. In the early 1950s the researchers who produced the first clad glass optical fibers were not thinking of using them for communic

In the early 1950s the researchers who produced the first clad glass optical fibers were not thinking of using them for communic

admin2021-03-10  35
问题         In the early 1950s the researchers who produced the first clad glass optical fibers were not thinking of using them for communications.【C1】H __________, fiber optics was already a well-established commercial technology when the famous paper by Kao and Hockham, 【C2】__________(claim) the use of low-loss optical fibers for communication, appeared in 1966.The first low-loss silica fiber was described in 【C3】__________which appeared in October of 1970.The date of this publication is sometimes 【C4】__________(cite) as the beginning of the era of fiber communication.Although this development did receive 【C5】__________(consider) attention in the research community at the time, it was far from inevitable that a major industry would evolve.
        The technological barriers appeared formidable because there were serious doubts as to 【C6】wh__________ these fiber components could ever be produced economically enough, but the market potential was very significant.【C7】__________(consequence), research and development activity expanded rapidly, and a number of important issues were 【C8】 re__________ during the early 1970s.During the middle and late 1970s, the rate of progress towards marketable products accelerated as the emphasis 【C9】__________(shift) from research to engineering.Fibers with losses 【C10】app__________ the Rayleigh limit of 2 dB/km at a wavelength of 0.8μm were produced.
        By 1980 improvement in component performance, cost, and reliability led to major commitments on the part of telephone companies.
【C4】
选项
答案cited
解析 句意为:这篇文章发表的日期经常被人们称为光纤通信时代的起始日。cite和日期之间是动宾关系,动作发出者是人们,故用cite的被动语态cited。
转载请注明原文地址:https://jikaoti.com/ti/LgtMFFFM
本试题收录于： C类竞赛（非英语专业本科）题库大学生英语竞赛（NECCS）分类
0

C类竞赛（非英语专业本科）

大学生英语竞赛（NECCS）

相关试题推荐
随机试题
最新回复(0)