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
2023-10-17
68
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] 【C1】
选项
答案
However
解析
此处句意发生转折。此句译为:50年代初期,那些生产出第一批复合玻璃光纤的研究者们尚未考虑将光纤应用到通信中。然而,当1966年Kao和Hockham发表著名论文,提出把低耗光纤应用于通讯中时,纤维光学已经成为一个相当成熟的商业技术了。
转载请注明原文地址:https://tihaiku.com/zcyy/3105090.html
相关试题推荐
Whatisatthetopofthelistofspeciesextinctions?[originaltext]Researchers
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
TheBigPictureA)It
Wehadsometrouble(drive)______throughthesnow.driving我们在开车通过雪地时遇到了一些困难。与动名
治疗变异型心绞痛,应首选( )A肾上腺素能β受体阻滞剂 B.钙通道阻滞剂
建设工程质量管理条例》规定,未经()签字,建筑材料、建筑构配件和设备不得在工程
2002年11月5日,经国务院批准,中国证监会和中国人民银行发布了《合格境外机构
预备压,用来补偿施工中的压力损失,设定泥水式盾构泥水压控制值时,预备压通常取(
A.氨酚曲马多B.氯胺酮C.氨酚羟考酮D.地芬诺酯E.去痛片按第一类精神药品管理
与普萘洛尔药动学特点不符的是A.血浆蛋白结合率高 B.口服吸收快而完全 C.
第二段讲二十四节气时,指出节气“可称阳历的一部分”,这样说是()。A.因为他
左心室内容积最小的是A.等容收缩期末 B.等容舒张期末 C.快速射血期末
最新回复
(
0
)