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valvula de cierre : 66 phrases in 14 subjects |
| Agriculture | 1 |
| Automated equipment | 2 |
| Automobiles | 1 |
| Chemistry | 4 |
| Earth sciences | 7 |
| Ecology | 1 |
| Electronics | 5 |
| General | 1 |
| Materials science | 2 |
| Mechanic engineering | 12 |
| Metallurgy | 3 |
| Pest control | 1 |
| Technology | 18 |
| Transport | 8 |