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
16
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/3108980.html
相关试题推荐
(1)Menandwomentendtochoosedifferentcareerpaths,andresearchershav
(1)Menandwomentendtochoosedifferentcareerpaths,andresearchershav
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
______Ican’thelpadmiringtheman’scourage,Idonotapproveofhismethods.
[originaltext]M:HeyLisa,wanttograblunchwithme?W:Sure.M:Yeah.Youse
Forthelastfiftyyears,theglobehasbeenwarmingup.Itistruethat
对于轻型木结构体系,梁在支座上的搁置长度不得小于下列哪一个数值?()A.60
语文小测验后,老师发现学生对于已讲过的课文理解的程度不一样,导致分数有的高,有的
患者男,45岁。因恶心,头痛36h,糖尿病昏迷2h就诊。患者意识模糊,面色潮红,
Thechangeinthatvillagewasmiraculou
在处方书写中,缩写词“ac.”代表的含义是A:每日6次 B:饭前 C:睡前
商业银行关系人包括()。 A.商业银行的董事B.商业银行的管理人员 C.
在组织流水施工时,确定流水节拍应考虑的因素有()。A.所采用的施工方法和施
最新回复
(
0
)