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
49
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] 【B7】
选项
答案
photography
解析
转载请注明原文地址:http://tihaiku.com/zcyy/2828462.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
Childrenmodelthemselveslargelyontheirparents.Theydoso【1】throughide
Childrenmodelthemselveslargelyontheirparents.Theydoso【1】throughide
Childrenmodelthemselveslargelyontheirparents.Theydoso【1】throughide
Childrenmodelthemselveslargelyontheirparents.Theydoso【1】throughide
Childrenmodelthemselveslargelyontheirparents.Theydoso【1】throughide
随机试题
AGaintheMBArecognisedworldwideUnlikeotherMBAs,theC
Wemayhearchildrensay"whathewants?".Thisisanexampleof__________.A、in
暂时性流水作用包括()。A.坡面细流的地质作用 B.山洪急流的地质作用 C.
A.Pandy实验 B.墨汁染色法 C.磺基水杨酸-硫酸钠比浊法 D.Ri
周三下午某护士在门诊接诊,发生一个流感病人,几小时上报()。A.2小时 B.1
以下关于腭小凹的描述,错误的是A.腭小凹是口内黏液腺导管的开口 B.位于上腭中
在编制施工图预算中的人工费、材料费、机械使用费单价时,实物量法与定额单价法相比(
硬化后的混凝土检测裂缝、孔隙和弹模系数可采用()。A.超声波 B.钻孔
与基础代谢率成正比的是( )。A.身高 B.体重 C.腰围 D.体表面积
右侧血胸患者,急诊入院。查体:脉搏120次/分,血压10.7/6.7kPa,气管
最新回复
(
0
)