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
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/3444724.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
Childrenmodelthemselveslargelyontheirparents.Theydoso【1】throughide
Childrenmodelthemselveslargelyontheirparents.Theydoso【1】throughide
Childrenmodelthemselveslargelyontheirparents.Theydoso【1】throughide
Childrenmodelthemselveslargelyontheirparents.Theydoso【1】throughide
随机试题
His________behaviormadeeveryonenervous.Hewasalwaysrushingtoopendoors
Kathywasauniversitystudent.Likemoststudentsshehadverylittlemone
牵正散的组成是A.全蝎、川芎、自附子 B.白附子、蜈蚣、全蝎 C.白附子、僵
产后出血导致失血性休克时的补血原则是()。A.补充同等失血量 B.补充1/2失
属于阴道杀精药的是A.左炔诺孕酮 B.氯地孕酮 C.米非司酮 D.壬苯醇醚
(2021年真题)下列各项中,应计入产品成本的有()。A.产品售出后发生的维修
隐患内容中,未按审批的专项施工方案施工属于( )类别重大隐患。A.工程管理
水利工程施工监理专业乙级资质的监理单位,可以承担下列()的监理业务。A.大(2)
治疗脑水肿应首选下列哪种药物A、呋塞米 B、螺内酯 C、氢氯噻嗪 D、甘露
施工进度计划调整的内容,不包括()调整。A.工作关系 B.工程量 C.资源
最新回复
(
0
)