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средний диаметр : 21 phrases in 9 subjects |
| Analytical chemistry | 2 |
| Aviation | 1 |
| Chemistry | 1 |
| Gear train | 6 |
| Mechanic engineering | 3 |
| Mining | 2 |
| Nuclear physics | 4 |
| Packaging | 1 |
| Pharmacology | 1 |
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