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
23
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
24岁初产妇,末次月经不详,行产科检查,腹围94cm,宫高33cm,超声测量胎儿
在互联网迅速发展的基础上,电子商务正在悄然兴起,但差不多所有的电子商务网站都在亏
隧道监控量测时,量测部位和测点布置,应根据()等确定。A、地质条件 B、量
下列著作与作者对应不正确的是:A.《忏悔录》——奥古斯丁 B.《人性论》——萨
城市总体规划和详细规划的重要内容不包括( )。A.道路选线 B.交通管理设施
简述人民法院受理劳动争议诉讼案件的条件。
个人外汇账户及外币现钞管理中,应经国家外汇管理局核准的有()。A.开立外国投资者
对于中止犯,可以比照既遂犯从轻或者减轻处罚。()
不引起剥脱性龈病损的疾病是A:白斑 B:天疱疮 C:扁平苔藓 D:类天疱疮
CPI控制网要按()标准施测。A.一等GPS B.二等GPS C.一等导
最新回复
(
0
)