antenna 发表于 2025-3-30 12:00:09
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Elias Posoukidisraces the circumference and goes out of the circle in the afternoon. Mark these two points on the circle with dots. These two points, between themselves, will be almost along the east-west. For this reason, these are termed east and west points. These would have been the exact east and west points i并排上下 发表于 2025-3-30 22:52:24
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Mechanics of Solids,f problems, we also describe the constitutive (or material) behavior. This is a complicated and extensive subject; our interest, however, is elastic behavior because that is the operational regime for most structural materials. Staying within the elastic limit is an important consideration and so some consideration is given to failure theories.nominal 发表于 2025-3-31 14:54:19
Introduction: A Sketch of the History and Scope of the Field,and strength of materials. Through the years its meaning has been extended to cover the study of the motions of all kinds of particles and continua, including quanta, atoms, molecules, gases, liquids, solids, structures, stars, and galaxies. In a generalized sense it is applied to the analysis of an