Urea508
发表于 2025-3-23 13:21:15
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松紧带
发表于 2025-3-23 15:13:09
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我吃花盘旋
发表于 2025-3-23 20:58:25
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挣扎
发表于 2025-3-24 00:04:47
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Glutinous
发表于 2025-3-24 05:10:22
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独特性
发表于 2025-3-24 07:25:46
Book 1990rinciple. It states that the periodic solutions of a Hamiltonian system are extremals of a suitable integral over closed curves. In other words, the problem is variational. This fact was known to Fermat, and Maupertuis put it in the Hamiltonian formalism. In spite of its great aesthetic appeal, the
Venules
发表于 2025-3-24 11:30:19
Book 1990 celestial mechanics, they are found by perturbation theory: there is a small parameter € in the problem, the mass of the perturbing body for instance, and for € = 0 the system becomes completely integrable. One then tries to show that its periodic solutions will subsist for € -# 0 small enough. Poi
使饥饿
发表于 2025-3-24 15:59:04
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incarcerate
发表于 2025-3-24 20:37:01
Shane D. Johnson,Kate J. Bowers,Dan J. Birks,Ken Peaseorary campaigns against pandemic flu, education campaigns have been used to prepare the general public for apocalyptic events.Governments have made use of various media from films, leaflets and television to the internet to inform, inspire and scare populations.Forms of disaster education also perme
专心
发表于 2025-3-25 01:20:02
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