- open hearth refining
- open-hearth refining
- 平炉: open-hearth furnace; open he ...
- 精炼: refine; purify affinage; fin ...
- 电炉精炼: electric furnace refining
- 反射炉精炼: reverberatory refining
- 酸性转炉精炼: bessemer converter refining
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