渗透
发表于 2025-3-28 16:16:12
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连锁,连串
发表于 2025-3-28 20:27:39
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障碍
发表于 2025-3-29 00:33:45
Fluid dynamic principles,based on a few basic physical laws only. In this chapter these will be briefly reviewed and their general nature illuminated. Emphasis will be on the phenomena which are of special interest and significance to the pump engineer. Basic knowledge of the terms of fluid dynamics is taken for granted. Th