|
secondary ?- rays : 11 phrases in 9 subjects |
| Astronautics | 1 |
| Astronomy | 1 |
| Electronics | 1 |
| Makarov | 1 |
| Mining | 1 |
| Nuclear physics | 1 |
| Oilfields | 1 |
| Radiation | 3 |
| Technology | 1 |
|
secondary ?- rays : 11 phrases in 9 subjects |
| Astronautics | 1 |
| Astronomy | 1 |
| Electronics | 1 |
| Makarov | 1 |
| Mining | 1 |
| Nuclear physics | 1 |
| Oilfields | 1 |
| Radiation | 3 |
| Technology | 1 |