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。

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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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Vertical three-screw pump smooth operation, low noise.

立式三螺杆泵运行平稳，噪音低。

youdao