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
13
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
Whichcompanyismentionedasasponsorofthemovie?[originaltext]M:Hi,W,I
Hermotherwouldbecominginsoon,andwouldexpecttofind______(土豆去了皮,饭桌摆好了
实施科教兴国战略,是要把加速科技进步放在经济社会发展的关键地位,使经济建设真正转
甲公司2019年的每股收益为6元,股利支付率为40%,预计从2020年开始将保持
下列不是PowerPoint视图方式的是( )A.大纲视图 B.页面视图
关于药物功效的叙述不妥的是( ) A.紫河车为气血阴阳并补之品 B.鹿茸专
根据《期货市场客户开户管理规定》的规定,期货公司应当向()提交客户交易编码申请
北京市海淀区的甲公司向北京市朝阳区的乙公司开具了一张100万元的汇票以支付货款
名址系统、电子化支局系统、商函投递系统属于邮政综合计算机网应用系统中的()。A:
发生索赔事项,索赔费用的计算方法有()等。A.综合费用法 B.实际费用法
最新回复
(
0
)