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
2024-08-16
13
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] 【C1】
选项
答案
However
解析
此处句意发生转折。此句译为:50年代初期,那些生产出第一批复合玻璃光纤的研究者们尚未考虑将光纤应用到通信中。然而,当1966年Kao和Hockham发表著名论文,提出把低耗光纤应用于通讯中时,纤维光学已经成为一个相当成熟的商业技术了。
转载请注明原文地址:https://tihaiku.com/zcyy/3722021.html
相关试题推荐
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Thefarmproducedmorefoodthan______thoughtpossibleduringWorldWarII.A、eve
随机试题
Thedestructionofournaturalresourcesandcontaminationofourfoodsuppl
Theviewthat"thereisnodirectlinkbetweenlinguisticformandwhatitrefer
下列关于剩余股利政策优缺点的说法中,不正确的有( )。A.有利于保持最佳资本结
A.心绞痛发作时,心电图示此导联ST段抬高 B.增加心肌需氧量为因素诱发的心绞
Thechangeinthatvillagewasmiraculou
患者女性,38岁,近5天来间歇性寒战、高热、头痛,持续4~6小时,大量出汗后体温
可以承接30万平方米以下的住宅项目和8万平方米以下的非住宅项目的物业管理业务的是
Webelievethat_________recentchanges
量化交易模型实盘交易前一般需要进行历史数据的回测。
舌体边缘的淋巴管部分引流至下颌下淋巴结,另一部分至A.颏下淋巴结 B.下颌下淋
最新回复
(
0
)