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
50
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] 【C6】
选项
答案
whether
解析
此句可译为:该技术障碍似乎难以逾越,因为人们十分怀疑这些纤维构件是否可以以足够低的成本生产出来,但是市场潜力是十分巨大的。
转载请注明原文地址:https://tihaiku.com/zcyy/3722446.html
相关试题推荐
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
FiveCommonMistakesinConversationandTheirSolutionsI.Notlis
TheuniquenessoftheJapanesecharacteristheresultoftwoseeminglycont
Simplywalkingthroughanunfamiliarneighborhoodcanmakeyoufeelmorepar
WhyDrugTestingIsNeededA)Theillicitdrugtradein
词头用于构成SI单位的倍数单位,()。A、不得单独使用 B、可以单独使用
关于肺结核病原学论述不正确的是A、肺结核是由结核分枝杆菌引起 B、肺结核是由结
美国的Buzzsaw.com于( )开始运行。A:1980年 B:1985年
根据公司法律制度的规定,下列关于国有独资公司的表述中,正确的是()。A.董事会
A.病理性黄疸 B.生理性黄疽 C.胆道闭锁 D.新生儿溶血症 E.新生
骨折的特有体征是 A.疼痛与压痛 B.功能障碍 C.肿胀与瘀斑 D.骨擦
最新回复
(
0
)