单词：direct current excited iron core reactor
单词：direct current excited iron core reactor 相关文章
This is Scientific American's 60-Second Science, I am Cynthia Graber.This'll just take a minute. On earth, snow crystals as we all know, form from frozen water. But scientists believe there're also flakes that fall on Mercury, and they're made of iro
Scientific American(六)月
This is Scientific Americans 60-Second Science. Im Karen Hopkin. This will just take a minute. Thars gold in them thar hillsand we may have meteorites to thank. Because it appears that a rain of meteors nearly 4 billion years ago peppered the Earths
Scientific American(九)月
All Risks 一切险 F.P.A. (Free from Particular Average) 平安险 W.A. / W.P.A (With Average or With Particular Average) 水渍险 War Risk 战争险 F.W.R.D. (Fresh Water Rain Damage) 淡水雨淋险 Risk of Intermixture and Contamination 混杂、玷
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Easily confused by this idea, there has a big thawed iron inner core, so that I think it's just the bar magnet, just permanent magnet frozen in nad, and that's where causes all the magnetic field. But it's too hot inside the Earth, that can't happen
自然百科2011年
Have you ever considered the possibility that the sun will eventually burn out? Don and Yael discuss that sobering thought on this Moment of Science. [OUTSIDE INSECT SOUNDS] D: Wow, what a beautiful s
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【英文原文】 Like all stars, the sun is basically a giant nuclear reactor that burns hydrogen to create energy. But like any reactor, the sun needs fuel to keep going. Its been going strong for around four-point-five billion years, and will pro
英语听力广播—Listening