生产活性碳的原料来源受到一定的限制。
磨具按其原料来源分,有天然磨具和人造磨具两类。
Abrasives source of their raw materials, there are two kinds of natural abrasive and artificial abrasives.
介绍了己烷的原料来源,重点介绍了其工业分离方法。
The article brief the origin of hexane and stress the method of industrial separation.
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