 |
| |||
| natural background radiation; natural radiation background | |||
| радиационный естественный фон: 7 phrases in 6 subjects |
| Business style | 1 |
| Ecology | 1 |
| General | 1 |
| Medical | 1 |
| Military | 1 |
| Nuclear physics | 2 |
|
| |||
| natural background radiation; natural radiation background | |||
| радиационный естественный фон: 7 phrases in 6 subjects |
| Business style | 1 |
| Ecology | 1 |
| General | 1 |
| Medical | 1 |
| Military | 1 |
| Nuclear physics | 2 |