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
63
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.【46】H______, fiber optics was already a well-established commercial technology when the famous paper by Kao and Hockham,【47】______ (claim) the use of low-loss optical fibers for communication, appeared in 1966. The first low-loss silica fiber was described in【48】______which appeared in October of 1970. The date of this publication is sometimes【49】______(cite) as the beginning of the era of fiber communication. Although this development did receive【50】______ (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【51】 wh______these fiber components could ever be produced economically enough, but the market potential was very significant.【52】______(consequence) , research and development activity expanded rapidly, and a number of important issues were【53】re______during the early 1970s. During the middle and late 1970s, the rate of progress towards marketable products accelerated as the emphasis【54】______(shift) from research to engineering. Fibers with losses【55】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]
选项
答案
However
解析
此处句意发生转折。此句泽为: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/3109490.html
相关试题推荐
Someresearchersfeelthatcertainpeoplehavenervoussystemsparticularly_____
(1)Menandwomentendtochoosedifferentcareerpaths,andresearchershav
(1)Menandwomentendtochoosedifferentcareerpaths,andresearchershav
Whatisatthetopofthelistofspeciesextinctions?[originaltext]Researchers
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
MilkinsCorporationwillnegotiateatwo-yearemployment______withtheformervi
Ifthewoundedsoldierhadbeengivenfirst______,hewouldnothavedied.A、help
[originaltext]W:Helpmewiththisstackofbooks,willyou,Jack?M:Helpyou!
Newtechnologylinkstheworldasneverbefore.Ourplanethas【B1】______.It
A.天王补心丹 B.酸枣仁汤 C.归脾汤 D.桑螵蛸散 E.六味地黄丸肝
目前临床上使用的烷化剂不包括A.氮芥类B.乙撑亚胺类C.磺酸酯及多元卤醇类D.亚
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
商业助学贷款的贷款审批人审查的内容包括()。A.借款申请人资格是否具备 B.
(2018年真题)期货公司应当按照监控中心的规定以()方式在公司总部集中统
存款人日常经营活动发生的资金收付以及工资、奖金的支付,都应该通过()办理。A、银
最新回复
(
0
)