1、
Study on phenolic compounds from the low-boiling fractions of pine tar oil
松焦油低沸点馏分中酚类物质的化学成分研究
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2、
The low-boiling inflammable part and the high-boiling residue both had to be discarded as useless.
低沸点 易燃部分和高沸点之残渣油均须弃置用.
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3、
在-100°～-20℃的低温下，将溶剂和低沸点成分蒸发掉而分离出加合物。
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4、
