首页
登录
职称英语
In the early 1950s the researchers who produced the first clad glass optical
In the early 1950s the researchers who produced the first clad glass optical
游客
2024-08-17
55
管理
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. 8 μm were produced.
By 1980 improvement in component performance, cost, and reliability led to major commitments on the part of telephone companies. [br] 【C6】
选项
答案
whether
解析
此句可译为:该技术障碍似乎难以逾越,因为人们十分怀疑这些纤维构件是否可以以足够低的成本生产出来,但是市场潜力是十分巨大的。
转载请注明原文地址:http://tihaiku.com/zcyy/3723556.html
相关试题推荐
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
Grandma,whatabigandficklemetaphoryoucanbe!Forchildren,thenametr
CollegeStudents’SocialResponsibilities1.许多大学生缺乏社会责任感,比如……2.造成这种现象的原因3.大学生应
Severalyearsago,Ilearnedthataphysicianinatownnottoofarfromwhe
通过兴奋中枢化学感受器增强肺通气的有效刺激是A. B. C. D. E.
单纯性高血压无其他合并症,血压高于多少时应先进行治疗后再拔牙A.22.7~12.
王先生夫妇估计需要在55岁二人同时退休时准备退休基金150万元,王先生夫妇还有2
假设某投资者在2013年12月31日,买入1股A公司股票,价格为100元,201
A题干由四种字母组成,其组合形式为ABCDDCA,只有A项符合。
人在每一瞬间,将心理活动选择了某些对象而忽略了另一些对象。这一特点指的是注意的(
水渍险的保险责任包括()。A.自然灾害及外来风险造成的部分损失 B.自然灾害
最新回复
(
0
)