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| 高频电流感应淬火; 高频感应淬火高频电流感应淬火高频电流感应淬火 | |||
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закалка током высокой частоты : 5 phrases in 4 subjects |
| Electronics | 1 |
| General | 1 |
| Metallurgy | 1 |
| Technology | 2 |
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