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refractory : 74 phrases in 14 subjects |
Chemistry | 18 |
Coal | 3 |
Construction | 3 |
Electronics | 4 |
Environment | 2 |
General | 6 |
Health care | 1 |
Industry | 8 |
Labor law | 2 |
Materials science | 1 |
Mechanic engineering | 3 |
Medical | 4 |
Metallurgy | 18 |
Natural sciences | 1 |