Amphoteric monomer is prepared with acrylic acid , dimethylamine and chloroethanol by Mannich reaction.以丙烯酸、二甲胺、环氧氯丙烷为原料,通过曼尼希反应制得两性离子单体.Biological activities of amphoteric surfactants to higher or lower organisms were i...
Reactions in liquid HF are known that illustrate also amphoteric behavior, solvolysis, or complex formation.已知在液态HF中,也能说明两性行为溶剂分解或络合物形成作用的反应.Biological activities of amphoteric surfactants to higher or lower organisms we...
"And now, without further ado, let me introduce our benefactor."“下面，闲话少说，让我来介绍一下我们的赞助人。”We collected ￡478 , but a very generous benefactor made it up to ￡500.我们募捐了478英镑, 一位非常慷慨的捐款人凑足到500英镑." Mr. Li is not only the school...
The walls were decorated by incrustation with marble.墙上镶嵌着大理石的装饰面.A pigeon probably has his Huff Duff in that incrustation above his beak.鸽子也有它的无线电高频测向仪,也许就是它喙上部的那个硬包吧.The result indicates that the prevention and removal...
零售商们有几份价格明细表.Retailers have several price schedules.我可以在哪儿拿到 免税 商品的明细表 呢 ?Where can I get a list of all those duty - free goods?你有这次旅行的开支明细表 吗 ?Do you have the expense breakdown of your trip?...