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
83
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/3108978.html
相关试题推荐
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
Write2waysthatterminateanoffer.RevocationRejectionLapseoftimeDeatho
Rockclimbingisanactivityinwhichparticipantsclimbup,downoracross
某部战士小明精神饱满、动作敏捷、学习新事务快,工作作风顽强,军事素质非常过硬,但
A. B. C. D.
常用于检识生物碱的试剂是()。A.碘化铋钾B.醋酸镁C.盐酸镁粉D.三氯化铝E
行政指令:是指行政主体依靠行政组织的权威,运用行政手段,包括行政命令、指示、规定
试比较不同取样方式的优点与不足。
对于特别行政区,下列说法正确的是()。①特别行政区设立的依据是我国宪法②人大
在资金投入环节,提高效率的重点是( )。A.增大产出 B.扩大资金来源 C
(2019年真题)某县政府发布公告,要求北苑小区居民与县政府协商拆迁安置补偿款事
最新回复
(
0
)