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
43
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
这些报纸通常在上班高峰期时在地铁站里发放。Thepapersareusuallyhandedoutatthesubwaystationsin
Herdiligenceandintelligence______________________(弥补了她缺乏经验).compensatedfo
目前认为乳腺癌最有效的检出方法是()。A.防癌普查体检 B.红外线 C.B
下列选项中,表示要坚持适度原则的是( )。A.因地制宜 B.对症下药 C.注
A.及时收集完整、准确的资料 B.综合资料 C.计算分析资料,剔除不合格资料
共用题干 WhenWeAreAsleepEveryonedreams,
A.淡蓝色 B.淡红色 C.淡黄色 D.淡绿色 E.白色儿科处方印刷用纸
下列连线中,行政行为的听证程序与听证分类不相符的是()。A.直辖市《城乡规划条
投资项目决策分析与评价的基本要求包括贯彻落实科学发展观、资料数据准确可靠和()
燃烧的三要素为氧化剂、点火源和可燃物。下列物质中属于氧化剂的是()A:氯气B:
最新回复
(
0
)