1·In this paper, the classification and synthesis methods of amino-acid type amphoteric surfactant, and the progress of its application in leather industry were introduced.
本文综述了氨基酸型两性表面活性剂应用于皮革中的研究动向，并重点介绍了其分类及合成方法。
2·A qualified amphoteric ionic surface active agent is achieved in a lab through an organic synthetic reaction.
通过有机合成反应，在实验室制得符合条件的两性离子型表面活性剂。
3·Proteins behave either as acids or bases and are said to be amphoteric.
蛋白质习性又像酸又像碱，因此说它是两性的。
4·Method of treatment of mineral materials by amphoteric polymers, mineral materials obtained, their use as an agent to reduce colloidal quantities in the production of steam.
使用两性聚合物处理矿物材料的方法，由此获得的矿物材料，以及它们作为在造纸过程中减少胶体数量的减少剂的用途。
5·The synthesis of larch extract tannin amphoteric water treatment agent was divided into three phases.
在实验过程中落叶松单宁两性水处理剂的合成主要分为三个阶段。