звукопроницаемость : 15 phrases in 11 subjects |
Acoustics | 1 |
Aviation medicine | 1 |
Electronics | 3 |
Mass media | 1 |
Medical | 1 |
Metallurgy | 1 |
Natural resourses and wildlife conservation | 1 |
Navigation | 1 |
Occupational health & safety | 1 |
Technology | 3 |
Telecommunications | 1 |