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
2023-10-17
57
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/3106980.html
相关试题推荐
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
【B1】[br]【B5】A、knockedB、hitC、beatC击鼓为“beatthedrum”,而且由too一词可推知本空应填beat。
YouwillhearDesmondButler,ownerofKlikset,talkingabouthowhecreated
(Give)______betterattentioninthecoldweather,thoseanimalscouldhaveavo
某高原筑路工程队,长期食用罐头食品,许多工人出现下肢皮下瘀点、瘀斑、出血,齿龈肿
重症肝病使尿淀粉酶()A:增高 B:降低 C:不变 D:先增高后降低
必测项目量测频率一般根据测点距开挖面的距离及位移速度分别确定,然后取两者中的频次
习近平总书记指出:“实现中华民族伟大复兴,教育的地位和作用不可忽视。”国家之所
2020年上半年,我国农产品进出口总额达1159.0亿美元。农产品进口额为807
郁证主要的临床表现有A.心情抑郁 B.咽中如有异物梗阻 C.易怒善哭 D.
关于供热管道支、吊架安装的说法,错误的有()。A.管道安装前,应完成支、吊架的
最新回复
(
0
)