首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
In the early 1950s the researchers who produced the first clad glass optical fibers were not thinking of using them for communic
In the early 1950s the researchers who produced the first clad glass optical fibers were not thinking of using them for communic
admin
2013-02-27
76
问题
In the early 1950s the researchers who produced the first clad glass optical fibers were not thinking of using them for communications.【46】H______, fiber optics was already a well-established commercial technology when the famous paper by Kao and Hockham,【47】______ (claim) the use of low-loss optical fibers for communication, appeared in 1966. The first low-loss silica fiber was described in【48】______which appeared in October of 1970. The date of this publication is sometimes【49】______(cite) as the beginning of the era of fiber communication. Although this development did receive【50】______ (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【51】 wh______these fiber components could ever be produced economically enough, but the market potential was very significant.【52】______(consequence) , research and development activity expanded rapidly, and a number of important issues were【53】re______during the early 1970s. During the middle and late 1970s, the rate of progress towards marketable products accelerated as the emphasis【54】______(shift) from research to engineering. Fibers with losses【55】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.
选项
答案
shifted
解析
shift指位置或方向的移动、改变;指由一种形式或用途改变为另一种形式或用途。
转载请注明原文地址:https://kaotiyun.com/show/UgVK777K
本试题收录于:
C类竞赛(非英语专业本科)题库大学生英语竞赛(NECCS)分类
0
C类竞赛(非英语专业本科)
大学生英语竞赛(NECCS)
相关试题推荐
Theyabusedtheirpowerandbulliedthepeople,thusarousing________discontentamongthemasses.
Allofthis________,shestillholdstheideathatthedevelopmentoftheInternetmakespeoplelosetheirsenseofplace.
DealingwithLifeAbroadIntroduction.millionsofpeoplegoabroadtowork,studyortravel.symptomsofculture
DealingwithLifeAbroadIntroduction.millionsofpeoplegoabroadtowork,studyortravel.symptomsofculture
CriticalThinkingandInnovativeWritingThetraditionalwayofteaching.studentsareurgedto【T1】________things.
CriticalThinkingandInnovativeWritingThetraditionalwayofteaching.studentsareurgedto【T1】________things.
CriticalThinkingandInnovativeWritingThetraditionalwayofteaching.studentsareurgedto【T1】________things.
(1)Menandwomentendtochoosedifferentcareerpaths,andresearchershaveidentifiedthisasthebiggestreasonmenmakemor
随机试题
申请小型汽车准驾车型驾驶证的人年龄条件是多少?
树图的用途有哪些?
患者,男性,48.岁,肺癌晚期,目前意识模糊,肌张力消失,心音低钝,脉搏细弱,血压下降,间歇呼吸。该患者处于
小儿五迟中立迟为小儿五迟中发迟为
甲氨蝶呤能干扰__________的合成。
(2006)“现代建筑不是老树上的分枝,而是从根上长出来的新株”。这一观点由谁提出的?
混凝土抗冻等级是按()龄期的试件用快冻试验方法测定的。
代理中国人民银行业务指根据政策、法规应由中央银行承担,但由于机构设置、专业优势等方面的原因,由中央银行指定或委托商业银行承担的业务,主要包括()。
盈利能力不足会导致直接借款需求产生。()
Inafewweeksorsothewreckerswillcome.Theywillteardownthetwovenerablebrickandbrownstonemansionsthathavestood
最新回复
(
0
)