Based on the principles of fractional reduction and step dilution, when retrieving Cadmium from Cd dross, percentage purity of Cd powder can reach to 99.

本文采用分步还原、梯级稀释理论从废镉渣中回收出了纯度高达99。

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METHODS: the lecithin was extracted and prepared from fresh yolks. The purity, the content, the percentage of oxidation and the quality standard were studied.

方法：以新鲜鸡蛋为原料提取并制备了卵磷脂，并对卵磷脂的纯度、含量、氧化程度以及质量标准进行考察。

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As to the economic characteristics, they had the features of big cocoon, high percentage of cocoon shell, long silk length, easy seperating of cocoon, good purity and superior quality.

在经济性状上具有茧型大，茧层率高，茧丝长，解舒易，净度好，丝质优的特点。

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