研完了钻井泵的机械效率及理论计算方法，具有一定的通用性。

Mechanical efficiency and its theoretical calculation method are studied, which are commonly used to a certain degree.

youdao

研完了钻井泵的机械效率及理论计算方法，具有一定的通用性。

Mechanical efficiency and its theoretical calculation method are studied, which are commonly used to a certain degree.

youdao