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
2024-08-14
28
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/3719713.html
相关试题推荐
Whatisthefindingreportedinthenews?[br][originaltext]16.Researchersha
Whatisthefindingreportedinthenews?[br][originaltext]16.Researchersha
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Howdidresearchersworkoutthelistoftheworld’smostinfluentiallanguages?
Intheearly1950stheresearcherswhoproducedthefirstcladglassopt
Intheearly1950stheresearcherswhoproducedthefirstcladglassopt
随机试题
Teachersandparentsareadvisedtoreviewthebookbecause______.[br][origi
WhichofthefollowingisINCORRECTaboutthewoman?[br][originaltext]M:Good
[originaltext]Whenitcomestodieting,losingweightfastholdssomeappea
对进厂检验不合格的材料、配件等,设备监理人员不同意使用的,应签发(),要求承
工程定位测量记录应在工程开工前由填写完成,报()审核签字后,由建设单位报规划部门
水痘病毒属于下列哪种病毒属()A.疱疹病毒 B.黄热病毒 C.副粘病
男性,33岁,因腰椎间盘突出症急性发作入院接受牵引治疗,护理措施正确的是A:床尾
金融市场为市场参与者提供分散风险的可能,下列属于其实现方式的是()。A.保险机构
(2016年真题)()负责期货投资咨询业务从业人员的资格考试、资格认定、日
下列导致固定资产建造中断时间连续超过3个月的事项,不应暂停借款费用资本化的是(
最新回复
(
0
)