不满分子
发表于 2025-3-28 16:39:47
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FLIP
发表于 2025-3-28 21:01:38
Systems with mass explicitly dependent on position,ctives can be followed: systems with a material type of source, attached to particles continuously gaining or loosing mass and systems for which the variation of mass is of a “control volume type”, mass trespassing a control surface. This is the case if, for some theoretical or practical reason, par
腐烂
发表于 2025-3-29 01:24:11
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防御
发表于 2025-3-29 04:23:54
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