2. 外语
  3. 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

admin2009-06-15  64
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、massive
B、immense
C、enormous
D、considerable
答案D
解析 只有considerable适合修饰attention，意为“相当多的关注”。此句可译为：尽管当时这项技术在研究领域确实引起了极大的关注，但要发展成一个重要产业还相去甚远。
转载请注明原文地址:https://kaotiyun.com/show/1mLd777K
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
随机试题
最新回复(0)