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
6
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/3721579.html
相关试题推荐
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
【S1】[br]【S8】G形容词。这句话的意思是说"母亲的语言的确有影响"。这道题的关键是不要只把选项G理解成动词,除此之外还有形容词性,意思是"已经确立的
京剧脸谱(thefacialmakeupofBeijingOpera)是具有民族特色的一种独特的化妆方法。它最大的特点在于借助不同的色彩来展示
()责任保险()个人财产保险[br]()人身保险()产业保险D,I
人体内蛋白质种类远多于基因数的主要原因是()。A.复制 B.转录 C.逆转
在对一个系统进行需求分析后,通常会建立实体关系模型(E-R)图,在E-R图中,表
下列不属于非财务因素审查内容的是()。A.企业性质 B.组织架构 C.
把下面的六个图形分为两类,使每一类图形都有各自的共同特征或规律,分类正确的一项是
普通股股东是否具有优先认股权,取决于认购时间与股权登记日的关系,该日称为除息日。
课业及进程的结合叫( )。 A.教程 B.课程 C.课表 D.学期
下列属于按索赔事件的性质分类的有()。A.合同中明示的索赔 B.工程延期索
最新回复
(
0
)