إشارات متقارنة: 44 phrases in 13 subjects |
Acoustics | 1 |
Electric machinery | 1 |
Electronics | 3 |
Fishery fishing industry | 4 |
Lighting other than cinema | 1 |
Mathematics | 1 |
Microsoft | 1 |
Piezoelectric crystals | 1 |
Power lines | 2 |
Radio | 1 |
Rail transport | 8 |
Telecommunications | 12 |
Telegraphy | 8 |