·2,447,543篇论文数据,部分数据来源于NoteExpress
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
应用推荐
模块上移
模块下移
不移动