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
2024-08-14
6
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] 【C10】
选项
答案
approaching
解析
approaching the Rayleigh limit接近瑞利极限。
转载请注明原文地址:https://tihaiku.com/zcyy/3719713.html
相关试题推荐
Whatisthefindingreportedinthenews?[br][originaltext]16.Researchersha
Whatisthefindingreportedinthenews?[br][originaltext]16.Researchersha
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Howdidresearchersworkoutthelistoftheworld’smostinfluentiallanguages?
Intheearly1950stheresearcherswhoproducedthefirstcladglassopt
Intheearly1950stheresearcherswhoproducedthefirstcladglassopt
随机试题
ItisnotthefirsttimethatI______byhimduringmycooperationwithhim.A、wa
从整个20世纪历史过程看,国际政治关系的内容基本上由()构成。A.各国际政治主体
因特网最高层域名分为机构性域名和地理性域名两大类,目前主要有14种机构性域名,其
在施工质量处理过程中,按照施工验收规范和相关的质量标准,并结合实际量测、试验和检
《中华人民共和国国歌法》于2017年10月1日起施行。该法是为了维护国歌的尊严,
A.2000 B.500 C.1000 D.250
维生素C又名( )。A.硫胺素 B.胡萝卜素 C.抗坏血酸 D.叶酸
多瓶组单元独立内贮压式七氟丙烷气体灭火系统的组件不包括()。A.信号反馈装置
当过去感知过、思考过或体验过的事物重新出现时,我们能够识别出来的心理现象叫((
隧道防排水包含()。A.结构防排水、特殊防排水 B.结构防排水、施工防排水
最新回复
(
0
)