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1·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。

2·Immersible degrees in oil Wells with low pump efficiency were adjusted by using the relation curves.

利用该关系图对泵效低下的油井沉没度进行调整，取得了较好的效果。