obturador: 71 phrases in 15 subjects |
Agriculture | 3 |
Chemistry | 10 |
Construction | 2 |
Cultural studies | 1 |
Earth sciences | 1 |
Electronics | 2 |
General | 7 |
Industry | 1 |
Materials science | 12 |
Mechanic engineering | 19 |
Medical | 3 |
Natural sciences | 1 |
Patents | 1 |
Radio | 1 |
Transport | 7 |