three screw pump
英 美
Figure 1 that the three screw pump cutaway view.
图1表示三螺杆泵的剖视图。
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。
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