| reference frequency | |
| commun. el. | frequência de referência |
|
stabilised : 48 phrases in 11 subjects |
| Chemistry | 5 |
| Communications | 2 |
| Earth sciences | 1 |
| Electronics | 26 |
| Environment | 1 |
| Industry | 1 |
| Mechanic engineering | 3 |
| Medical | 1 |
| Technology | 2 |
| Transport | 5 |
| Waste management | 1 |