Several humic acids of different molecular weight were fractionated by means of fractional solution containing various volume ratios of ethanol and ethyl acetate.
以不同体积比的乙醇和乙酸乙酯分级溶解方法，分离出了几种不同分子量的腐殖酸。
Several humic acids of different molecular weight were fractionated by means of fractional solution containing various volume ratios of ethanol and ethyl acetate.
以不同体积比的乙醇和乙酸乙酯分级溶解方法，分离出了几种不同分子量的腐殖酸。
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