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impuretés : 77 phrases in 14 subjects |
Agriculture | 3 |
Antennas and waveguides | 5 |
Chemistry | 4 |
Communications | 1 |
Earth sciences | 5 |
Electronics | 39 |
General | 2 |
Health care | 5 |
Industry | 3 |
Materials science | 1 |
Medical | 3 |
Metallurgy | 3 |
Technology | 2 |
Transport | 1 |