prick-test 发表于 2025-3-23 12:25:01
Report on ICT in Education in Latvia,te was launched on paper, on the draft table, in numbers crunched by fast computers. Already in 1957 V. A. Egorov published a voluminous work containing results of an analysis of trajectories of lunar flights. In this short essay we will pause only briefly to discuss Egorov’s investigations, wCurmudgeon 发表于 2025-3-23 15:36:54
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https://doi.org/10.1007/978-981-99-4460-6ticles in an electric field (ion engines, operating on the principle of interaction of an electric current with a magnetic field, plasma engines, and other types of engine ). The reactive thrust produced by such engines, unlike that produced by engines that use a chemical fuel, is very small anMendacious 发表于 2025-3-24 00:21:39
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László Bartosiewicz,Dóra Mérai,Péter Csippán“Hold your hands out to the Sun... What do you feel? Heat, of course. But there’s pressure as well - though you’ve never noticed it, because it’s so tiny. Over the area of your hands, it comes to only about a millionth of an ounce.”Ergots 发表于 2025-3-24 19:52:53
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On the Unperturbed and Perturbed Motion of a Satellite, with a Digression on Asymptotic Methods of We begin our story with a description of some classical results, perhaps a bit too well known to intrigue and stir the reader’s interest, but absolutely necessary for our exposition.