| |||
| 工程技术人员 | |||
|
engineers and technicians : 4 a las frases, 4 temas |
| Ciencias de la tierra | 1 |
| Consultante | 1 |
| General | 1 |
| Petróleo | 1 |
| |||
| 工程技术人员 | |||
|
engineers and technicians : 4 a las frases, 4 temas |
| Ciencias de la tierra | 1 |
| Consultante | 1 |
| General | 1 |
| Petróleo | 1 |