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
51
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] 【C10】
选项
答案
approaching
解析
approaching the Rayleigh limit接近瑞利极限。
转载请注明原文地址:https://tihaiku.com/zcyy/3722450.html
相关试题推荐
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
TheHistoryoftheLunchBoxA)Itwasmadeofshiny,br
Skin.Itisthelargestorganofthebody.Skinisthebody’s【C1】______toin
结节性多动脉炎的主要治疗用药为A.非甾体抗炎药 B.对症治疗 C.免疫抑制剂
农会原本是中国共产党领导的以研究农学、改良农业为宗旨的组织。但在1927年7月2
挂篮质量与梁段混凝土的质量比值控制在( ),特殊情况下不得超过0.7。 A、
下列口服降糖药中,最适宜儿童或肥胖型患者的是A.格列吡嗪 B.二甲双胍 C.
2009年,某省全年粮食作物播种面积253.85万公顷,比上年增长1.5%
()提出世界上第一个绿色建筑综合评估系统。A:英国B:美国C:加拿大D:澳
小区会所与一般俱乐部的不同点在于()。A:小区会所功能更全面B:小区会所只对业
牙周病发生的始动因素是A.牙菌斑 B.牙石 C.白垢 D.食物嵌塞 E.
最新回复
(
0
)