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| sistema de calefacción directa; sistema directo | |||
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direct system : 37 phrases in 13 subjects |
| Agriculture | 2 |
| Communications | 7 |
| Earth sciences | 3 |
| Electricity generation | 1 |
| Electronics | 12 |
| Energy industry | 2 |
| Finances | 1 |
| General | 2 |
| Life sciences | 2 |
| Natural sciences | 1 |
| Nuclear physics | 1 |
| Security systems | 1 |
| Transport | 2 |
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