英语词汇fractional solvent extraction怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	fractional solvent extraction
释义	fractional solvent extraction 简明释义分步溶剂萃取网络释义 1 [冶]?分步溶剂萃取 ... foundry sand 型砂 fractional solvent extraction 分步溶剂萃取 Frank-Read source 弗兰克-里德位错源 ... 双语例句 1 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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