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impureté : 89 phrases in 17 subjects |
| Agriculture | 1 |
| Antennas and waveguides | 4 |
| Chemistry | 6 |
| Communications | 1 |
| Earth sciences | 4 |
| Electronics | 42 |
| General | 2 |
| Health care | 5 |
| Industry | 5 |
| Medical | 2 |
| Metallurgy | 3 |
| Pest control | 1 |
| Piezoelectric crystals | 1 |
| Semiconductors | 2 |
| Technology | 6 |
| Textile industry | 3 |
| Transport | 1 |
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