|
continuous working : 8 phrases in 5 subjects |
| Business | 1 |
| Economics | 3 |
| Firefighting and fire-control systems | 1 |
| Mining | 1 |
| Oil / petroleum | 2 |
|
continuous working : 8 phrases in 5 subjects |
| Business | 1 |
| Economics | 3 |
| Firefighting and fire-control systems | 1 |
| Mining | 1 |
| Oil / petroleum | 2 |