resonance frequency: 54 phrases in 12 subjects |
Antennas and waveguides | 1 |
Astronautics | 1 |
Electrical engineering | 2 |
Electronics | 9 |
Geophysics | 3 |
Makarov | 3 |
Military | 2 |
Physics | 3 |
Seismology | 2 |
Silicate industry | 1 |
Technology | 20 |
Telecommunications | 7 |