GOST 10969-1991 Brown coals and lignites Determination of yield of toluene-soluble extract and content of acetone-soluble materials (resinous substances) in it《褐煤 测定甲苯可溶萃取物的产量及其中丙酮.pdf

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GOST 10969-1991 Brown coals and lignites Determination of yield of toluene-soluble extract and content of acetone-soluble materials (resinous substances) in it《褐煤 测定甲苯可溶萃取物的产量及其中丙酮.pdf_第1页
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