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
2023-10-18
61
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] 【C2】
选项
答案
claiming
解析
现在分词作后置定语。
转载请注明原文地址:https://tihaiku.com/zcyy/3108976.html
相关试题推荐
(1)Menandwomentendtochoosedifferentcareerpaths,andresearchershav
(1)Menandwomentendtochoosedifferentcareerpaths,andresearchershav
(1)Menandwomentendtochoosedifferentcareerpaths,andresearchershav
Whatisatthetopofthelistofspeciesextinctions?[originaltext]Researchers
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
Traditionally,universitieshavecarriedouttwomainactivities:researchan
Onestudentskippedaclassandthensenttheprofessoranemailmessageask
MemoTo:AlltheStaffFrom:Mr.Zhang,thePer
A. B. C. D.
故宫这些年为应对群众的传统文化激情想了很多招,“萌萌哒”的文化创意产品,火爆一时
某建筑高度为42m,耐火等级为一级,地上10层,地下2层。一到三层为商业部分,四
在终值和计息期一定的情况下,贴现率越低,则复利现值越小。
患者,女,28岁,停经40天,妊娠试验结果阳性,平时月经周期32天。20天前因泌
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
(2021年真题)根据《中华人民共和国固体废物污染环境防治法》,关于工业固体废物
最新回复
(
0
)