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
2024-08-16
12
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/3721577.html
相关试题推荐
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
PhysicalEducationI.BriefintroductionofthecoursesA.PhysicalFitnessIn
Whichofthefollowingsentenceshasasubjectcomplement?A、Lisawasseenplayin
Olderadultswhohaveahighlevelofdailyactivitieshavemoreenergy________
药效学是研究A.机体如何对药物处置 B.药物的临床疗效 C.药物对机体的作用
建设工程造价咨询合同当事人一方要求变更或解除合同时,则应当在( )日前通知对方
某甲亢病人用抗甲状腺药物治疗已两年,目前无任何甲亢症状,血清总T、总T正常,据此
油浸变压器有载开关储油柜有轻微渗油,未形成油滴属于一般缺陷。
产品审核是供应商审核的主要形式之一,其主要内容包括()。 A.质量审核B.
售出的产品,在产品质量保证期内出现了质量问题,销售者应当承担()。
( )的情况下,企业年金可一次性领取。A.员工升学 B.员工死亡 C.出境
最新回复
(
0
)