sample extraction and concentration
sample extraction and concentration
样品提取和浓缩
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The effects of sample concentration, ultrasonic extraction time, and different extracting solvent on the extraction of volatile microconstituents were also investigated.
研究了样品萃取量、超声波萃取时间、以及不同萃取溶剂对微量挥发性成分萃取效果的影响。
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