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我厂用废铜末与杂铜精炼铜锭的经验,是在去年由工人和技术人员仿效土法熔炼结合火法精炼的原理试验成功的。
Our experience of using copper scrap and copper scrap to refine copper ingots was successfully tested by workers and technicians in the light of the principle of fire refining combined with fire refining last year.