首页
登录
职称英语
The idea of television, transmitting pictures through the air or over wires,
The idea of television, transmitting pictures through the air or over wires,
游客
2024-02-12
22
管理
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】______. [br] 【B8】
选项
答案
images
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3444729.html
相关试题推荐
The【B1】______ofclosed-circuittelevisionandothernewelectronicteaching
The【B1】______ofclosed-circuittelevisionandothernewelectronicteaching
The【B1】______ofclosed-circuittelevisionandothernewelectronicteaching
The【B1】______ofclosed-circuittelevisionandothernewelectronicteaching
The【B1】______ofclosed-circuittelevisionandothernewelectronicteaching
The【B1】______ofclosed-circuittelevisionandothernewelectronicteaching
The【B1】______ofclosed-circuittelevisionandothernewelectronicteaching
The【B1】______ofclosed-circuittelevisionandothernewelectronicteaching
Childrenmodelthemselveslargelyontheirparents.Theydoso【1】throughide
Childrenmodelthemselveslargelyontheirparents.Theydoso【1】throughide
随机试题
[originaltext]W:Canyoudropbythelabforaminute?Ihavesomeexperiments
Doweneedlawsthatpreventusfromrunningriskswithourlives?Ifso,th
[originaltext]W:Hey!Areyougoingtoplaysometennisthisafternoon?M:Well
Ourbrainshavebeenprocessingsophisticatedinformationviaoursensesfor
鹅口疮的发病,可由胎热内蕴,口腔不洁,感受秽毒之邪所致。其主要病变在()A
关于鲸蜡和蜂蜡的叙述错误的是A.具有一定的表面活性作用 B.两者均含有少量游离
2004-141.湿热痢的治法是 A.清热燥湿B.化湿健脾C.
肠结核的好发部位为( )。A.空肠 B.回肠 C.升结肠 D.回盲肠
内部环境分析主要包括()。 A.信贷资金供求状况分析B.信贷动机分析 C
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
最新回复
(
0
)