Field application shows that an immersible pump method is the most ideal method for the oil vacuum unloading system of rail tank wag.
实践表明，卸槽潜油泵法是火车槽车负压卸油系统改造的最理想方法。
Based on principle in speed regulation of centrifugal pump, method of speed regulation calculation for energy saving and its effects have been studied.
本文从离心泵变速调节原理入手，探讨了以节能为目标的离心泵变速调节的计算方法和效果。
Based on principle in speed regulation of centrifugal pump, method of speed regulation calculation for energy saving and its effects have been studied.
本文从离心泵变速调节原理入手，探讨了以节能为目标的离心泵变速调节的计算方法和效果。
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