首页
登录
职称英语
In the early 1950s the researchers who produced the first clad glass opt
In the early 1950s the researchers who produced the first clad glass opt
游客
2023-10-16
11
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 0.8μm were produced.
By 1980 improvement in component performance, cost, and reliability led to major commitments on the part of telephone companies. [br] 【C1】
选项
答案
However
解析
空格上下文的句意为:50 年代初期,那些生产出第一批复合玻璃光纤的研究员们尚未考虑将光纤应用到通信中。然而,当1966年卡奥和霍克姆发表著名论文,提出把低耗光纤应用于通讯中时,光纤已经成为一项相当成熟的商业技术了。可以看出上下文句意有转折,故根据提示字母此空应填入However。
转载请注明原文地址:https://www.tihaiku.com/zcyy/3103714.html
相关试题推荐
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
Forthispart,youareallowedthirtyminutestowriteacompositiononthetopi
Livingisrisky.Crossingtheroad,drivingacar,flying,swallowinganasp
Althoughwealreadyknowagreatdealaboutinfluenza,itisdifficultfore
标准贯入试验不适用于下列哪种地层? A.砂土B.节理发育的岩石类C.粉土
患者,男,40岁。多食易饥3个月,体重下降5kg,口干渴,大便干燥,舌苔黄,脉滑
关于同工酶的描述中正确的是A.蛋白分子结构相同 B.溶解度相同 C.分子结构
1.企业标识是代表企业()的一种符号。 (A)形象(B)特征(
李老师在教育过程中,深入了解学生,针对学生不同的发展水平、兴趣、爱好和特长,引导
学校派骨干教师王老师外出参加培训。王老师说:“我经常给别人做讲座,哪里还需要去接
简述现代企业人力资源管理各个历史发展阶段的特点。
最新回复
(
0
)