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
2023-07-11
25
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] 【B3】
选项
答案
reality
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2828458.html
相关试题推荐
[originaltext]Likemostotherfolkart,thecalendarpictureswerenotcons
[originaltext]M:Didyoutakethesepictures?They’reverygood.W:Yes,Ithin
[originaltext]M:Didyoutakethesepictures?They’reverygood.W:Yes,Ithin
[originaltext]MyfirstsemesterofcollegewastheworstI’vebeenthrough.
[originaltext]MyfirstsemesterofcollegewastheworstI’vebeenthrough.
[originaltext]Narcissus,ahandsomeyoungman,waswalkingthroughthewood
[originaltext]Narcissus,ahandsomeyoungman,waswalkingthroughthewood
【B1】[br]【B5】[audioFiles]audio_eufm_j01_329(200910)[/audioFiles]breakthrough语义
Throughouthistorythebasicunitofalmosteveryhumansocietyhasbeenthe
Throughouthistorythebasicunitofalmosteveryhumansocietyhasbeenthe
随机试题
Expertsestimatethatsomewherebetween【B1】______and【B2】______ofeverythingw
Whatwasthepossiblereasonfortheshuttlethsaster?[originaltext]NASA’s
《断魂枪》中孙老者的基本性格定位是( )A.乐观爽朗 B.爱艺如命 C.积
A.脉缓慢无力B.发生典型的士的宁惊厥症状C.瞳孔扩张D.面色苍白E.口中有金属
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性:
当前,各地政府高度重视生态环境保护,习近平总书记曾引用“子钓而不纲,弋不射宿”来
交流电流回路的设计有一些基本要求,下列正确的说法是()。 A.在某些特殊情况下
在施工图预算的编制中,设备购置费由()构成。A.设备原价和采购保管费 B
在直线回归分析中,得到回归系数为0.30,经检验有统计学意义,说明A.y增加一个
用Ⅲ型肺炎球菌多糖免疫裸鼠(或胸腺切除)会出现A.无细胞免疫应答和体液免疫应答
最新回复
(
0
)