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tiempo del : 28 phrases in 11 subjects |
| Antennas and waveguides | 1 |
| Automatic control | 2 |
| Electric motors | 1 |
| Electricity generation | 1 |
| Electronics | 6 |
| General | 4 |
| Piezoelectric crystals | 1 |
| Power lines | 4 |
| Rail transport | 1 |
| Thermal Energy | 1 |
| Vacuum tubes | 6 |
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