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
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. 8 μm were produced.
By 1980 improvement in component performance, cost, and reliability led to major commitments on the part of telephone companies. [br] 【C3】
选项
答案
publication
解析
从下句的this publication可知答案为publication。
转载请注明原文地址:https://tihaiku.com/zcyy/3105092.html
相关试题推荐
Whatisatthetopofthelistofspeciesextinctions?[originaltext]Researchers
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
[originaltext]W:It’salwaysdifficulttodecidewhatnottodo,isn’tit?M:I
PhilanthropyIthasbeco
Asfoodistothebody,soislearningtothemind.Ourbodiesgrowandmusc
[originaltext]WeddingsintheUnitedStatesvaryasmuchasthepeopledo.
冯先生,用力排便后出现肛门剧痛,无便血。检查见肛管皮下暗紫色肿块,有触痛。首先考
红外热像仪可以直接检测泄漏的SF6气体()
QQQ.2.6抢救过程注意事项。 QQQQ.2.6.1抢救过程中的再判定:
具有先进的教学理念属于教师的()。 A.人格素养B.学科专业素养 C.教
性热有大毒,功能蚀疮去腐的药物是A.升药 B.轻粉 C.砒石 D.铅丹
按皮亚杰的观点,形式运算阶段思维的主要特点包括()。A、思维形式摆脱了具体内容的
最新回复
(
0
)