 |
| natural frequency: 61 phrases in 27 subjects |
| Acoustics | 1 |
| Aerohydrodynamics | 1 |
| Astronautics | 6 |
| Automated equipment | 2 |
| Aviation | 4 |
| Aviation medicine | 2 |
| Bridge construction | 1 |
| Building structures | 1 |
| Construction | 3 |
| Electrical engineering | 2 |
| Electronics | 1 |
| Environment | 1 |
| Makarov | 4 |
| Mass media | 1 |
| Mathematics | 2 |
| Mechanics | 2 |
| Metallurgy | 2 |
| Metrology | 2 |
| Nautical | 7 |
| Navigation | 1 |
| Nuclear and fusion power | 1 |
| Robotics | 2 |
| Seismology | 2 |
| Technology | 5 |
| Telecommunications | 2 |
| Thermal engineering | 1 |
| Wood processing | 2 |