time spread : 19 phrases in 12 subjects |
Chemistry | 1 |
Electronics | 1 |
Firefighting and fire-control systems | 1 |
General | 7 |
Mass media | 1 |
Mathematics | 1 |
Non-destructive testing | 1 |
Polymers | 1 |
Radiation | 1 |
Seismology | 1 |
Technology | 2 |
Telecommunications | 1 |