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| естественная радиация | |||
| собственное излучение | |||
| природная радиация | |||
| естественное излучение | |||
| фоновое излучение | |||
| natural radiation: 49 phrases in 15 subjects |
| Astronautics | 3 |
| Business style | 1 |
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| General | 1 |
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| Makarov | 7 |
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| Nuclear physics | 21 |
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