... crude woodwork machinery 粗木工机械 crude wool 原毛 crude zinc 粗锌 ...
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Based on the idea of classifying and then disposing impurities in the crude lanolin recovered from wastewater of wool-washing, three steps to refine lanolin are presented.
从对回收所得的粗羊毛脂中所含杂质进行分类处理的思路出发，得出对羊毛脂进行精制的三个步骤。
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