 |
| frequency ratio: 41 phrases in 15 subjects |
| Antennas and waveguides | 2 |
| Astronautics | 1 |
| Automobiles | 3 |
| Aviation | 1 |
| Electrical engineering | 1 |
| Electronics | 15 |
| Mass media | 1 |
| Mathematics | 1 |
| Medical | 2 |
| Metrology | 1 |
| Military | 1 |
| Oil and gas | 1 |
| Radio | 1 |
| Technology | 7 |
| Telecommunications | 3 |