For fluid dynamics parameters, media properties of check valve performance relationship in China, in order to promote the drill string check valve research theory and technology progress.

寻求流体动力学参数、介质性质对止回阀性能的影响关系，以推进我国钻柱止回阀研究理论和技术进步。

youdao

For fluid dynamics parameters, media properties of check valve performance relationship in China, in order to promote the drill string check valve research theory and technology progress.

寻求流体动力学参数、介质性质对止回阀性能的影响关系，以推进我国钻柱止回阀研究理论和技术进步。

youdao