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| 炼铁厂 | |||
| 高炉车间; 高炉炼铁厂 | |||
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| 炼铁厂 | |||
| 炼钢厂; 高炉车间 | |||
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blast furnace plant : 4 phrases in 1 subject |
| Metallurgy | 4 |
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