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| spettrale | |||
| densità spettrale di...; concentrazione spettrale di… | |||
| spektral: 39 phrases in 12 subjects |
| Antennas and waveguides | 2 |
| Coal | 1 |
| Communications | 5 |
| Earth sciences | 9 |
| Electronics | 9 |
| Health care | 1 |
| Immigration and citizenship | 2 |
| Lighting other than cinema | 3 |
| Physical sciences | 1 |
| Radio | 1 |
| Statistics | 4 |
| Transport | 1 |