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北京读者孙明、河南读者李书贵等许多同志最近来信,希望我刊介绍一些钢铁常温发黑剂的使用情况,以便更广泛地推广应用。
Recently, many readers, including Sun Ming from Beijing and Li Shugui from Henan, recently wrote a letter asking us to introduce the use of some steel blackening agent at room temperature for wider application.