By this method, when the surface dynamometer card is known, the dynagraph at the pump can be accurately determined;

用这种方法，在地面示功图已知时，可以精确地确定井下泵的示功图；

youdao

By this method, when the surface dynamometer card is known, the dynagraph at the pump can be accurately determined;

用这种方法，在地面示功图已知时，可以精确地确定井下泵的示功图；

youdao