This paper describes the principles and methods of extracting humic acid product from lignite. 摘要論述了褐煤中提取腐殖酸產品的方法及原理。
Humus was added into nonorganic silt to clarify the effect of a variety of additives on the cemented soil performance. 在去除有機質的黏質粉土中加入腐殖酸，研究了經某種液態添加劑改良后的水泥土特性。
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