单词:electron-beam parametric amplifier
[电] 电子束参数放大器
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A: Something's wrong with my computer. B: What's the problem? A: My computer won't turn on. B: Did you see if all the connections are right? A: I'm not sure I understand what you mean. B: The connections between your CPU and your outlet. A: Is that w
发表于:2018-11-30 / 阅读(124) / 评论(0)
英语情景对话-日常生活
2 What are the two speakers doing? [A] Walking down a hill [B] Climbing stairs [C] Discussing a trip
发表于:2018-12-30 / 阅读(60) / 评论(0)
听听测测
3 Where are the two speakers? [A] In a restaurant [B] On a farm [C] At the man's home
发表于:2018-12-30 / 阅读(58) / 评论(0)
听听测测
Neutrons and protons occupy the atom's nucleus. The nucleus of an atom is tinyonly one millionth of a billionth of the full volume of the atombut fantastically dense, since it contains virtually all the atom's mass. As Cropper has put it, if an atom
发表于:2019-02-17 / 阅读(35) / 评论(0)
万物简史