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| arco; colchete | |||
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| íris de guia de ondas | |||
| قوس: 29 phrases in 9 subjects |
| Antennas and waveguides | 2 |
| Electric traction | 1 |
| Electricity generation | 1 |
| Lighting other than cinema | 2 |
| Power lines | 2 |
| Satellite communications | 2 |
| Thermal Energy | 5 |
| Vacuum tubes | 3 |
| Welding | 11 |