信号 : 258 phrases in 16 subjects |
Electronics | 9 |
General | 1 |
Lighting other than cinema | 3 |
Magnetics | 3 |
Microsoft | 4 |
Power lines | 25 |
Radio | 47 |
Radiobiology | 1 |
Rail transport | 58 |
Semiconductors | 2 |
Sound recording | 2 |
Telecommunications | 47 |
Telegraphy | 47 |
Telephony | 3 |
Vacuum tubes | 2 |
Video recording | 4 |