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| frecuencia de la corriente | |||
| частота тока: 25 phrases in 8 subjects |
| Aviation | 1 |
| Chemistry | 1 |
| Electronics | 10 |
| Medical | 1 |
| Packaging | 1 |
| Plastics | 2 |
| Resins | 1 |
| Technology | 8 |
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