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- A cationic polymeric flocculant was chosen becasue its hydrolysate with positive ammonium group enhanced the adsorption of residual COD and improved the flocculation efficiency. 选择阳离子高分子絮凝剂，由于其水解产物带有正电荷铵盐基团，加强了残存COD的吸附，完善了絮凝分离过程。
- Some self-dispersion cationic polyurethane emulsion was prepared with quarternary ammonium groups in macromolecule chain. 合成了一系列的阳离子型水性聚氨酯乳液。
- A new colloid titration method for analyzing the degree of substitute (DS) of amphoteric starch with carboxylic and quaternary ammonium groups is first developed in this work. 摘要首次提出了用胶体滴定法测量季铵盐羧酸型两性淀粉的阴、阳离子取代度。
- The cationic starch with high degree of substitution bearing quaternary ammonium groups was prepared via reaction of starch with glycidyl trimethyl ammonium chloride (GTA) using the dry process. 3环氧丙基)三甲基氯化铵(GTA)阳离子化试剂,干法制备了高取代度季铵型阳离子淀粉。
- Education should not be restricted to any one specific age group. 教育不应限制在任何特定的年龄组上。
- He broke away from that lawless group years ago. 他在几年前脱离了那个非法团体。
- The group of barbaric soldiers killed many people. 那群野蛮的士兵杀了很多人。
- The group was made up of doctors. 这个团体是由医生组成的。
- A group of boys dashed out of the classroom. 一群男孩子从教室里冲出来。
- I come upon a group of children play in the street. 我遇到一群孩子在街上玩耍。
- He goes about with a group of nice boys. 他经常和一群好孩子在一起玩。
- He is a the most brisk young man in this group. 他是这个小组中最活跃的年轻人。
- He showed me a photo of a family group. 他给我看一张合家欢的照片。
- The chief accountant of a manufacturing group. 一个制造业集团的总会计师。
- The hunting group had good sport today. 今天打猎小组满载而归。
- I stand out in a group interview. 在集体面试中脱颖而出。
- He looked around the small group of mourners. 他环顾一下那一小群的送葬者。
- The group of destroyers damaged the bus. 那群破坏者毁坏了这辆公共汽车。
- He is the mainstay of our theatre group. 他是我们剧组的台柱。
- Synthesis and Property of Nano-fumed Silica Derivative with Quaternary Ammonium Group 气相法纳米二氧化硅季胺盐衍生物的合成和性能
