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
28
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/3106989.html
相关试题推荐
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
Intheeventoffire,thealarmwillsoundat______of10seconds.A、intervalsB、r
Thefirstparagraphindicatesthat[br]relievetensionandanxiety细节辨认题。由原文可知,在
Nosooner____________(我们到达山顶)thanweallsatdowntorest.hadwereachedtheto
Naturalflavoringsandfragrancesareoftencostlyandlimitedinsupply.Fo
下列哪一种混合液为1/3张A.2份生理盐水:1份5%葡萄糖:6份11.2%NaC
把下面的六个图形分为两类,使每一类图形都有各自的共同特征或规律,分类正确的一项是
2017年我国成年国民图书阅读率为59.1%,比上年增加0.3个百分点;报纸阅读
甲公司2019年1月1日发行票面利率为10%的可转换债券,面值1000万元,规定
在营业线桥梁改建施工中,加高桥梁墩台的方法包括()。A.砂浆垫高支座法 B.抬
某建设工程采用工程量清单计价方式计价,根据《建筑安装工程费用项目组成》(建标[
最新回复
(
0
)