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
33
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
(我们宿舍里没有穿衣镜,饭厅门口倒是有一面。每当我穿上一件漂亮的新连衣裙,我就禁不住暗暗地想往镜子里瞧瞧自己。)但总是在要去瞧的时候就感到特别不自在而踉跄离去—
影响急性风湿热发病的最重要因素是A.有风湿热家族史 B.有急性肾小球肾炎史
上市公司有下列情形之一的,由证券交易所决定暂停其股票上市交易。()A.公司有
功能润肺止咳,灭虱杀虫的药是A百部 B紫菀 C槟榔 D苦楝皮 E款冬花
2020年4月,某审计机关派出审计组,对某公司2019年度财务收支进行审计。有关
Hisnewgirlfriendhadomittedtotellh
某构筑物其基础底面尺寸为3mX4m,埋深为3m,基础及其上土的平均重度为20kN
刘某承包西瓜园,收获季节突然病故。好友刁某因联系不上刘某家人,便主动为刘某办理后
关于税收基本特征的说法,正确的是()A.强制性、无偿性和固定性是税收的绝对特征
根据《环境影响评价技术导则—生态影响》,关于不同评价工作等级生态现状调查要求的说
最新回复
(
0
)