порог слышимости: 32 phrases in 12 subjects |
Acoustics | 2 |
Cinematography | 1 |
Electronics | 5 |
Makarov | 2 |
Mass media | 2 |
Medical | 1 |
Natural resourses and wildlife conservation | 4 |
Occupational health & safety | 8 |
Physics | 1 |
Security systems | 1 |
Technology | 3 |
Telecommunications | 2 |