 |
| radar observation: 4 phrases in 4 subjects |
| Aviation | 1 |
| Meteorology | 1 |
| Natural resourses and wildlife conservation | 1 |
| Technology | 1 |
|
| radar observation: 4 phrases in 4 subjects |
| Aviation | 1 |
| Meteorology | 1 |
| Natural resourses and wildlife conservation | 1 |
| Technology | 1 |