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
43
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] 【C9】
选项
答案
shifted
解析
shift指位置或方向的移动、改变;指由一种形式或用途改变为另一种形式或用途。
转载请注明原文地址:https://tihaiku.com/zcyy/3723559.html
相关试题推荐
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
WhomostlikelyisMs.Hancock?[br][originaltext]MMs.Hancock,Ineedtheac
TheGovernmentisgoingtogivenew"jobsplitting",grantstoemployerswil
[audioFiles]2015m8x/audio_ezfj_ezflisteningd_20157_075[/audioFiles]
施工便桥,应设置()标志,验收后方可使用。A.限载 B.限宽 C.限速
A.a=-1,b=2 B.a=-1,b=-2 C.a=-1,b=-1 D.
小柴胡汤的组成药物中含有A.黄芩 B.干姜 C.白术 D.芍药 E.当归
共用题干 第二篇Shynessisthecauseofmuchun
绩效管理尽管其基本思想要求是绩效考评的各个环节都要实现科学与公平,但受( )等
属于下列情形之一的品种,应当从国家基本药物目录中调出的是A.易滥用的 B.根据
在价值工程的工作程序中,下列属于分析阶段的工作是()A.对象的选择和功能分析
最新回复
(
0
)