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| радиоактивный изотоп | |||
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Radioisotop : 39 phrases in 6 subjects |
| Hygiene | 2 |
| Missiles | 2 |
| Nuclear and fusion power | 5 |
| Nuclear physics | 19 |
| Радиоактивное излучение | 6 |
| Радиография | 5 |
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