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فرق : 34 phrases in 14 subjects |
Electric traction | 1 |
Electronics | 6 |
Lighting other than cinema | 1 |
Magnetics | 5 |
Mathematics | 2 |
Microsoft | 7 |
Physics | 1 |
Piezoelectric crystals | 1 |
Power lines | 1 |
Radio | 4 |
Radiobiology | 1 |
Sound recording | 2 |
Transformers | 1 |
Vacuum tubes | 1 |