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NF U44-108-1982 Fluid sludge from treatment of urban sewage Sampling for estimating the average content of a batch 《城市污水处理后的流体污泥 评估一批平均含量的取样》.pdf

NF U44-110-1982 Sludge Organic soil conditioners Growth media Preparation of partially dry test samples Expression of results 《污泥 有机土壤改良剂 生长培养基 试验用部分干试验样品的制备 试验结果的表述》.pdf

NF U44-140-1984 Fertilizers and soils conditioners Solubilizing of calcium and magnesium by hydrochloric attack 《肥料和土壤改良剂 钙和镁用盐酸侵蚀法增溶》.pdf

NF U44-147-1984 Fertilizers and soils conditioners Determination of calcium-EGTA complexometric method 《肥料和土壤改良剂 钙-egta络合滴定法测定》.pdf

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