利用尿素复合溶液从风化煤中提取水溶腐植酸和生成腐植酸络合酰胺态氮的研究
이용뇨소복합용액종풍화매중제취수용부식산화생성부식산락합선알태담적연구
Research on the Technology of Extracting Soluble Humic Acid from Weathered Coal by Urea Complex Solution and Complexation of Humic Acid-amide Nitrogen
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