The polished rod also forms part of the sealing system between the tubing and the atmospere in the stuffing box.

光杆还成为在油管与盘根盒空间之间的密封系统的组成部分。

youdao

The polished rod also forms part of the sealing system between the tubing and the atmospere in the stuffing box.

光杆还成为在油管与盘根盒空间之间的密封系统的组成部分。

youdao