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
24
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
SorryIneverdrinkmilk;itdoesn’t______me.A、agreetoB、agreeonC、agreewit
有关角化不良的描述,正确的是A.恶性角化不良时见不到细胞核 B.良性角化不良多
(2021年真题)下列关于现场调查的说法中,错误的是()。A.对资产法律权
男孩,9个月,10天来发热、咳嗽伴腹泻、呕吐,每天10余次,近几日好转,2天前嗜
简述多媒体教学的优势。
下列属于体罚学生的情形的是()A.让二年级的小学生一个生字抄写10遍 B.
基础心理学是研究()。 (A)正常成人心理现象的心理学基础学科 (B
甲公司2021年度发生与股权投资相关的交易或事项如下: (1)3月1日,甲公
共用题干 1909年,德国经济学家韦伯(AlfredWeber)在其《论工业区
投资项目从项目性质、经营主体、资金来源等多个方面划分,不同的项目在其决策要求、决
最新回复
(
0
)