 |
| |||
| widmowy; spektralny | |||
| gęstość widmowa; natężenie widmowe | |||
| spektral: 61 phrases in 12 subjects |
| Antennas and waveguides | 9 |
| Communications | 1 |
| Construction | 6 |
| Electronics | 4 |
| Lighting other than cinema | 29 |
| Mathematics | 2 |
| Natural sciences | 1 |
| Nuclear physics | 1 |
| Physical sciences | 1 |
| Piezoelectric crystals | 1 |
| Radio | 1 |
| Vacuum tubes | 5 |