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| порошковые фигуры; фигуры Акулова-Биттера | |||
| магнитный спектр | |||
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magnetic figures : 8 phrases in 5 subjects |
| Astronautics | 2 |
| Electrical engineering | 1 |
| Electronics | 2 |
| Metallurgy | 2 |
| Physics | 1 |
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