resonance frequency: 50 phrases in 15 subjects |
Air defense | 4 |
Automobiles | 1 |
Earth sciences | 1 |
Electric machinery | 1 |
Electronics | 8 |
Engineering geology | 1 |
Explosives and Explosive Ordnance Disposal | 2 |
General | 1 |
Metallurgy | 2 |
Oil / petroleum | 2 |
Piezoelectric crystals | 7 |
Space | 1 |
Technology | 16 |
Telecommunications | 2 |
Wind Energy | 1 |