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
23
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] 【C4】
选项
答案
cited
解析
此处为被动语态。句意为:这篇文章发表的日期经常被人们称为光纤通讯时代的起始日。
转载请注明原文地址:https://tihaiku.com/zcyy/3722444.html
相关试题推荐
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
Thisisnottrue.Ifthis(be)______true,Iwouldbesorryforit.were句子意为:这不是
Duringadolescence,thedevelopmentofpoliticalideologybecomesapparentin
在河豚鱼中河豚毒素含量最高的器官是( )。A.肌肉 B.卵巢和肝脏 C.皮
浙贝母主要含()。A.甾醇类生物碱B.异喹啉类生物碱C.吲哚类生物碱D.莨菪烷
采集承租客户信息的要点包括()。A:客户在哪里上班或上学 B:入住时间要求
Themotherabandonedherboyforpoornes
国际贸易惯例的客观特征体现为()。A.国际贸易惯例的非主权性 B.国际贸
以下毒物中,误服中毒、须用碳酸氢钠溶液洗胃的是A.瘦肉精 B.苯丙胺 C.苯
(2018年真题)2017年2月3日,甲继承了一套坐落于市中心的房屋。2017年
下列增值税应税行为,按照差额确定增值税计税销售额的有()。A.贷款服务 B.
最新回复
(
0
)