增强
发表于 2025-3-28 17:59:55
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乐章
发表于 2025-3-28 19:20:38
A Critical Review of the Evidence for a Former Direct Connection of South America with Africa,tinent, called Gondwanaland embracing India and all the continents of the southern hemisphere. At first the idea did not seem very startling, because it was well known that large continental areas had in the past been repeatedly invaded by the sea and because it was unknown that continents and ocean
对手
发表于 2025-3-29 00:58:17
ojects for further studyThis textbook offers an engaging account of the theory of ordinary differential equations intended for advanced undergraduate students of mathematics. Informed by the author’s extensive teaching experience, the book presents a series of carefully selected topics that, taken t
现晕光
发表于 2025-3-29 07:08:32
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