preliminary fire refining

... ) fire refined metal 火法精炼金属冶> ) preliminary fire refining 预先火法精炼 ) fire-refined copper 火法>精炼铜冶> ...

预先火法精炼,preliminary fire... ... ) fire-refined copper 火法>精炼铜冶> ) preliminary fire refining 预先火法精炼冶> ...