It's necessary to investigate the theory of the three screw pump.
所以对三螺杆泵的理论研究是非常必要的。
The main aim in this paper is the basic theory of the three screw pump.
于是在研究中主要是对三螺杆泵做基础理论的研究。
Vertical three-screw pump smooth operation, low noise.
立式三螺杆泵运行平稳，噪音低。
Vertical three-screw pump smooth operation, low noise.
立式三螺杆泵运行平稳，噪音低。
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