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The article brief the origin of hexane and stress the method of industrial separation.
介绍了己烷的原料来源，重点介绍了其工业分离方法。
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Psychogenic causes include boredom, stress, or separation anxiety.
精神因素包括无聊、压力或焦虑。
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Psychogenic causes include boredom, stress, or separation anxiety.
精神因素包括无聊、压力或焦虑。
youdao