 |
| |||
| annulus pack-off | |||
|
环空 封隔 : 6 phrases in 3 subjects |
| Drilling | 2 |
| Mining | 1 |
| Oil / petroleum | 3 |
The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Add | The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Report an error
| Get short URL | Language Selection Tips