抛物线 发表于 2025-3-28 17:39:05

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短程旅游 发表于 2025-3-29 01:30:59

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查看完整版本: Titlebook: Ray Optics, Fermat’s Principle, and Applications to General Relativity; Volker Perlick Book 2000 Springer-Verlag Berlin Heidelberg 2000 EF