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
39
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] 【C2】
选项
答案
claiming
解析
现在分词作后置定语。
转载请注明原文地址:https://tihaiku.com/zcyy/3722442.html
相关试题推荐
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
实现这个目标易如反掌。Achievingthosetargetswillbeabreeze.
WritingaLiteratureReviewI.DefinitionofLiteratureReview—It’sa(n)【T1】__
Lastweek,Tomandhisfriendscelebratedhistwentiethbirthday,______________
Everyeducationsystemisinevitablyamirrorthatreflectsthecultureoft
涂饰包括()涂饰分项。A.水性涂料 B.溶剂型涂料 C.水溶性涂料 D.乳
X线照射量的测量是利用X线特性中的A.电离作用 B.荧光作用 C.着色作用
吴茱萸A.显微特征可见果皮表皮细胞中散有油细胞B.显微特征可见非腺毛壁疣明显且簇
A. B. C. D.
教学计划的核心问题是()。 A.开设哪些科目 B.各门学科开设的顺序 C.
关于建设项目方案研究中的原材料与燃料供应方案研究的说法,正确的是()。A.原材料
最新回复
(
0
)