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| X-rays sources: 24 phrases in 10 subjects |
| Astronomy | 10 |
| Cybernetics | 1 |
| High energy physics | 1 |
| Makarov | 2 |
| Medical appliances | 3 |
| Metallurgy | 1 |
| Metrology | 3 |
| Microelectronics | 1 |
| Physics | 1 |
| Technology | 1 |
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