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
8
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.【46】H______, fiber optics was already a well-established commercial technology when the famous paper by Kao and Hockham,【47】______ (claim) the use of low-loss optical fibers for communication, appeared in 1966. The first low-loss silica fiber was described in【48】______which appeared in October of 1970. The date of this publication is sometimes【49】______(cite) as the beginning of the era of fiber communication. Although this development did receive【50】______ (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【51】 wh______these fiber components could ever be produced economically enough, but the market potential was very significant.【52】______(consequence) , research and development activity expanded rapidly, and a number of important issues were【53】re______during the early 1970s. During the middle and late 1970s, the rate of progress towards marketable products accelerated as the emphasis【54】______(shift) from research to engineering. Fibers with losses【55】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]
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/3724074.html
相关试题推荐
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
[audioFiles]audio_ezfm_0431(20104)[/audioFiles]Mostpeopleprefershortst
A--CapitalCityB--KeyCityC--CommonCityD--ProvincialBoundary
[originaltext]Amanhadtogotothecourt,andheaskedhislawyerwhichj
阅读以下应用说明以及用VisualBasic编写的程序代码,将应填入(n)处的
软件设计阶段一般又可分为______。A.逻辑设计与功能设计 B.概要设计与详
女性,26岁,停经40天,既往月经不规律。应首先进行的辅助检查是 A.妊娠试验
以下能与水、乙醇混溶的溶剂是A.油酸乙酯 B.肉豆蔻酸异丙酯 C.花生油
患者,女性,28岁,风湿性心脏病10年。患者于上楼、打扫卫生等活动时即感胸闷、心
慢性闭锁性牙髓炎的临床表现为,除外A.不定时的自发痛 B.热测引起迟缓性疼痛
以下属于应纳税所得额扣除项的是()。A.财政拨款 B.减免税额 C.政
最新回复
(
0
)