This paper introduces a design method of variable pitch screw, This methed make use of multinomial, bring out the boundary conditions which the design need and the operating range of the methed.
本文介绍了一种变螺距螺杆的设计方法，该方法采用多项式，并提出了设计所需的边界条件和这种方法的使用范围。
Operating under variable conditions will affect the efficiency of the crude oil heater seriously.
原油加热炉在变工况下运行会严重降低效率。
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