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
2023-10-18
24
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] 【C9】
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/3107449.html
相关试题推荐
Whatisatthetopofthelistofspeciesextinctions?[originaltext]Researchers
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
[originaltext]M:Whereshallwegoforourholidaythisyear?W:Let’shaveac
社区卫生服务的内容主要有A.社区诊断 B.社区参与 C.社区干预 D.信息
根据下面资料,回答7-10题 苔藓植物是地球上演化最成功的植物之一,是从水生植
新课改强调学生的主体作用,但不能淡化教师的作用。音乐课堂教学是一种由教师组织学生
下列关于证券投资基金分类的表述中,正确的是( )。 Ⅰ根据投资对象,分为增长
展开接线图中,不属于合闸回路编号的是()A.3 B.103 C.13
日本《呼声》月刊最新一期刊发日本京都造型艺术大学教授竹村真一撰写的《是全世界在污
古训“失之毫厘,谬以千里”与“胡蜂效应”______,两者都告诫要特别注意初始条
物有所值定性基本评价指标包括()。(新教材已删除)A.项目规模大小 B.
工程监理企业组织形式中,股份有限公司经理由()决定聘任或者解聘。A.股东会
最新回复
(
0
)