... foundry sand 型砂 fractional solvent extraction 分步溶剂萃取 Frank-Read source 弗兰克-里德位错源 ...
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The fractional extraction on Longkou lignite by different solvent was used for the studying of the occurrence modes and the variations of small molecular phases in coal.
研究煤萃取后的小分子相的赋存方式及其变化规律，用不同溶剂对龙口褐煤进行了分级萃取。
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