行星齿环式无游梁抽油机是一种新型的无游梁抽油机。
The non-beam pumping unit of planetary gear-ring type is a kind of new non-beam pumping unit.
本文在先期研究的基础上对行星齿环式无游梁抽油机进行了更加深入的研究。
In this thesis, the author performed further study on the non-beam pumping unit of planetary gear-ring type based on the previous study.
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