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| ferrous metals; first triad | |||
| black metal | |||
| ferrous metal (【技】通常指铁、铬、锰，亦包括钢及其他以铁为主的合金。) | |||
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| ferrous metal | |||
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| ferrous metal | |||
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黑 色金属 : 27 phrases in 11 subjects |
| Chemistry | 1 |
| Earth sciences | 1 |
| Economy | 1 |
| Electronics | 1 |
| Management | 1 |
| Metallurgy | 7 |
| Nautical | 1 |
| Oil / petroleum | 1 |
| Steel production | 1 |
| Technology | 11 |
| Watchmaking | 1 |
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