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
The idea of television, transmitting pictures through the air or over wires, has been around since the late 19th【B1】______.
The idea of television, transmitting pictures through the air or over wires, has been around since the late 19th【B1】______.
admin
2013-06-17
40
问题
The idea of television, transmitting pictures through the air or over wires, has been around since the late 19th【B1】______. But it wasn’t until 1925, when J. L. Baird, a Scottish【B2】______. became the first to electrically transmit moving pictures, that television became a【B3】______.
Baird’s first television was a mechanical system consisting of several moving parts. It had a small【B4】______ onto which pictures were transmitted 10 times per second at 30 lines of resolution (分辨率). With the help of a photoelectric cell (光电管), bright and dim light were【B5】______ into an electrical signal and sent via radio waves. In June 1925, Baird transmitted the【B6】______ of a human face, winking and smiling from one room of the laboratory to another, without the aid of【B7】______ or wires. Television truly came into its own in the 1930s with the advent of the cathode-ray tube (阴极射线管), which allowed for electronic line-by-line scanning of【B8】______. With the help of the Radio Corporation of America and an improved cathode-ray tube, the first all-electronic TV was demonstrated in 1932.【B9】______.
As television’s evolution continues, high-definition (分辨率) digital TV is supposed to replace today’s 625-1ine sets with 1,050 or more lines of resolution.【B10】______. This trend has developed very fast.【B11】______.
【B8】
选项
答案
images
解析
转载请注明原文地址:https://kaotiyun.com/show/LlM7777K
0
大学英语四级
相关试题推荐
FirstAidThemainpurposeoffirstaidistoprovidepropercaretosuddenlyiiiorinjuredpersonauntilmedicalhelp
ForanygiventaskinBritaintherearemorementhanareneeded.StrongunionskeepthemthereinFleetStreet,homeofsomeLo
ForanygiventaskinBritaintherearemorementhanareneeded.StrongunionskeepthemthereinFleetStreet,homeofsomeLo
Forthispart,youareallowed30minutestowriteanessayentitledOnEnglishLearning.Youshouldwriteatleast120wordsfo
TheAustralianstateofVictoriaisinvestinginaprogramtoidentifynewopportunitiesforitsfoodandagricultureindustries
YukonGoldRushDiscoveryInAugust1896,threepeopleledbySkookumJimMasonheadednorth,downtheYukonRiverfromthe
Thereisapopularbeliefamongparentsthatschoolsarenolongerinterestedinspelling.Thisis,however,a【1】.NoschoolIh
ElevendaysafterhersonBenjamin’sbirthbyC-section,LindaCoaleawokeinthemiddleofthenightinpain,onelegbadlyswo
Ourbrainshavebeenprocessingsophisticatedinformationviaoursensesformillionsofyears.Sowhyisitwearestill【B1】___
随机试题
以下对于目标管理的评价中,不正确的是()
符合宪法的形式主义
在Excel2010中,要使某单元格内输入的数据介于18至60之间,而一旦超出范围就出现错误提示,可使用()
结核杆菌侵入肠道的土要途径是
急性肾小球肾炎多在感染后几周起病
投标活动应遵循的原则是( )。
行政诉讼中的书证,作为证据的文书,是指以其内容、文字、符号、图画等来表达一定的思想并用以证明案件事实的材料。应当符合的要求包括()。
下列有关收入确认原则的表述中,正确的有()。
验钞机上发出的光能使钞票上的荧光物质发光,电视机的遥控器发出的光可控制电视机,对于它们发出的光,下列说法正确的是()
广域网覆盖的地理范围从几十公里到几千公里,它的通信子网主要使用()。
最新回复
(
0
)