首页
登录
职称英语
When was the first actual radio broadcast made? [originaltext] It was an Itali
When was the first actual radio broadcast made? [originaltext] It was an Itali
游客
2024-10-30
50
管理
问题
When was the first actual radio broadcast made?
It was an Italian inventor who created the first wireless device for sending out radio signals in 1895. But not until the American inventor Lee De Forest built the first amplifying vacuum tube in 1906 did we get the first radio as we know it. And the first actual radio broadcast was made on Christmas Eve of 1906. That’s when someone working from an experimental station in Brand Rock, Massachusetts, arranged the program of two short musical selections, a poem and a brief holiday greeting. The broadcast was heard by wireless operators on ships with a radio through several hundred miles. The following year, De Forest began regular radio broadcasts in New York. These programs were similar to much of what we hear on the radio today in that De Forest played only music. But because there were still no home radio receivers, De Forest’s audience consisted of only wireless operators on ships in New York harbor. There is no doubt that radio broadcasting was quite a novelty in those days. But it took a while to catch on commercially. Why? For the simple fact that only a few people, in fact, only those who tinkered with wireless telegraphs as a hobby, owned receivers. It wasn’t until the 1920’s that someone envisioned mass appeal for radio. This was radio pioneer, David Sarnoff, who predicted that one day there would be a radio receiver in every home.
选项
A、On Christmas Eve of 1906.
B、On Christmas Eve of 1960.
C、On Christmas Eve of 1895.
D、On Christmas Eve of 1859.
答案
A
解析
情景事实题。短文的开篇讲到“And the first actual radio broadcast was made on Christmas Eve of 1906.”即真正能用来广播的装置是De Forest于1906年圣诞夜时做成的。选项A为正确答案。
转载请注明原文地址:http://tihaiku.com/zcyy/3824264.html
相关试题推荐
Whatarespeakersmainlydiscussing?[br][originaltext]M:Howdidyoulikeyes
Whatarespeakersmainlydiscussing?[br][originaltext]M:Howdidyoulikeyes
Whatarethespeakersmainlydiscussing?[br][originaltext]W:DoctorWhite,we
Whatarethespeakersmainlydiscussing?[br][originaltext]W:DoctorWhite,we
Whatarethespeakersmainlydiscussing?[originaltext]W:DoctorWhite,werecen
Whatseemstosurprisethemanaboutthenewproduct?[br][originaltext]W:I’v
Whatseemstosurprisethemanaboutthenewproduct?[originaltext]W:I’vebeen
RichpeopleinBritainhavebeenhuntingfoxes[br][originaltext]Foxesand
RichpeopleinBritainhavebeenhuntingfoxes[br][originaltext]Foxesand
RichpeopleinBritainhavebeenhuntingfoxes[br][originaltext]Foxesand
随机试题
OneoftheprincipalofWalzer’scritiqueofliberalcapitalismisthatiti
A—groceryJ—furnitureshopB—roastmeatshopK—electricalapplianceshopC—
A.节点编号不对 B.有无箭头的连接 C.有循环回路 D.多个起点节点
根据消防水泵房的设计要求,错误的是( )。A.疏散门直通室外或安全出口 B.
循环水泵的设计下列要求不符合规范的是()。A.应尽量靠近游泳池 B.宜与循
女性,25岁,既往健康,突然咯血约500ml,查体:心肺未见异常,胸X线片双
下肢静脉曲张的临床表现A.大腿内侧及小腿外侧静脉曲张 B.大腿内外侧静脉曲
试问,钢结构框架内力分析时,∑N·Δu/(∑H·h)至少大于下列何项数值时宜采用
下列情形中,当事人可以提存的有()。A.货运合同中,收货人无正当理由拒绝受领货
法律是成文的道德,道德是内心的法律体现了法律和道德的区别与联系。()
最新回复
(
0
)