 |
| |||
| drilling-in unit (矿层钻进专用) | |||
| 小钻机: 25 phrases in 5 subjects |
| Drilling | 9 |
| Engineering geology | 3 |
| Mechanics | 4 |
| Oil / petroleum | 3 |
| Technology | 6 |
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