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
65
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] 【C10】
选项
答案
approaching
解析
approaching the Rayleigh limit接近瑞利极限。
转载请注明原文地址:https://tihaiku.com/zcyy/3105099.html
相关试题推荐
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
Musiccomesinmanyforms:mostcountrieshaveastyleoftheirown.Atthe
卢舍那佛、阿弥陀佛、弥勒佛分别是( )。A.三身佛之一、三世佛之一、三方佛之一
按照劣药处理的不包括A.未标明有效期的药品B.更改有效期的药品C.超过有效期的药
软膏剂油脂性基质为A.凡士林 B.月桂硫酸钠 C.泊洛沙姆 D.吐温61
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
为保障我国妇女权益,实行男女平等政策,我国颁布修订了《中华人民共和国妇女权益保障
简述现代企业人力资源管理各个历史发展阶段的特点。
下列关于自然人民事行为能力的说法中,正确的是:A.4岁的甲是无民事行为能力人
国内豆油现货与期货基差变动情况如下图所示。卖出套期保值的最佳时机和买入套期保值的
某建设项目达到设计能力后,全场定员2000人,工资和福利费按照每人每年20000
最新回复
(
0
)