 |
| 信号: 484 phrases in 19 subjects |
| Antennas and waveguides | 3 |
| Electricity generation | 2 |
| Electronics | 12 |
| General | 15 |
| Lighting other than cinema | 3 |
| Magnetics | 3 |
| Microsoft | 89 |
| Power lines | 28 |
| Radio | 110 |
| Radiobiology | 1 |
| Rail transport | 59 |
| Semiconductors | 2 |
| Sound recording | 2 |
| Telecommunications | 60 |
| Telegraphy | 82 |
| Telephony | 6 |
| Thermal Energy | 1 |
| Vacuum tubes | 2 |
| Video recording | 4 |