首页
登录
职称英语
What is the topic of the passage? [br] [originaltext] Some people say radio
What is the topic of the passage? [br] [originaltext] Some people say radio
游客
2024-10-14
29
管理
问题
What is the topic of the passage? [br]
Some people say radio was invented by Guglielmo Marconi of Italy. Marconi sent the first radio communication signals through the air in eighteen ninety-five. In fact, no one person can be called the inventor of radio. Many people, including several Americans, helped to develop radio.
De Forest developed some of the technology used in early radio. During his lifetime, he invented hundreds of devices that were used in telephones, shortwave radio broadcasts, and similar technology. His most famous invention was the vacuum tube, or electron tube. In nineteen-O-six, the electron tube was considered the single most important development in electronics. The device made it possible to strengthen radio signals and to send them over long distances. It was a major reason for the fast growth of the electronics and communications industries in the early part of the twentieth century.
Edwin Armstrong was another American inventor who was important in the development of electronics and radio communication. Armstrong developed technology that helped to improve radio reception. He discovered ways to limit unwanted radio signals. Edwin Armstrong also was a leader in using radio to reproduce sounds clearly. This process became known as frequency modulation, or FM radio. FM radio provided better sound reproduction and less noise or interference than traditional AM radio. Armstrong also developed radio receivers that became widely used.
选项
A、Telephones.
B、Electron tube.
C、Long wave radio broadcasts.
D、Shortwave radio broadcasts.
答案
B
解析
细节题。从“His most famous invention was the vacuum tube,or electron tube.”可知。
转载请注明原文地址:https://tihaiku.com/zcyy/3800350.html
相关试题推荐
MostoftheOlympicsceremoniesareto______.[originaltext]TheOlympicGam
HowdidtheEnglishChannelcomeintobeing?[br][originaltext]W:Tom,doyou
Whatdoyouknowaboutthewomanspeaker?[br][originaltext]W:Hello,Stall.C
Peopletendtocomplainalotaboutthe______risingpricesrecently.A、steeply
Wheredidthestormsfirststrike?[originaltext]About100peoplearenow
Themuseumaimsmainlytodisplay______.[br][originaltext]Goodmorning,
Themuseumaimsmainlytodisplay______.[br][originaltext]Goodmorning,
Themuseumaimsmainlytodisplay______.[originaltext]Goodmorning,ladies
WhatdidpeopleinEgyptsearchforyears?[br][originaltext]Foryearspe
WhatdidpeopleinEgyptsearchforyears?[br][originaltext]Foryearspe
随机试题
Mostofthepeoplewhoappearmostoftenandmostgloriouslyinthehistory
Haiti’sTourismA)LikemanyofitsCaribbeanneighbors,Haitioncedrewm
Mr.Bascombwasupset.Attimeslikethishewishedhehadneverbecomeaca
前馈控制系统是对干扰信号进行补偿的系统,是()。A.开环控制系统 B.闭环控制
标准符合性测试就是测量产品的功能和性能指标,与相关国家标准或行业标准所规定的功能
虽然厂家已经进行了出厂检验,新回弹仪在使用前也应该进行标定。()
商业银行财务分析的方法主要包括()。A.因素分析法 B.比较分析法 C
设计成果评审中,对功能性的要求内容有( )。A:建设规模、生产能力、产品方案、
采购文件要求中标或者成交供应商提交履约保证金的,供应商应当予以提供,其履约保证金
某建筑工程在城市市区范围内,建筑公司拟进行主体结构混凝土浇筑施工,使用运输及振捣
最新回复
(
0
)