单词:shortwave length magnetic recording
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US Christian Broadcaster Still Believes in Shortwave Since the dawn of wireless communications, international broadcasters, including the Voice of America, have used shortwave radio to communicate with the world. While many broadcasters now are switc
说一口流利的英语,从简单的单词开始。 听听,读读,背背,今天你的词汇量又增加了5个。 单词/词义 中英例句 单词听读 kneel [ ni:l ] She knelt to pray. v. 跪
By analyzing different samples of lava, Herrero / Bervera has built up a picture of how the filed has changed since long before humans were around. They are actually the recorders of the Earth's magnetic field in hundreds of years, thousands of years
Showcasing interesting and innovative online destinations Art Chimes | Washington, DC 04 December 2009 It fades in and out. ... But what I think that does is that adds a feeling of mystery. Time again for our Website of the Week, when we showcase int
VOA's weekly science and technology radio magazine Art Chimes | Washington, DC 04 December 2009 MUSIC: Our World theme This week on Our World: Climate change and its impact on health, ahead of the Copenhagen climate conference ... another hazard in c
听力文本 Recording 30 录音30 1. We've recently been doing some research involving mice. We were trying to find out what causes the cells in our body to age. 1、我们最近在做一些和老鼠有关的研究。我们尝试找出我们体内的细