提出了一种干柱层析法 分离提纯 试剂对氨基偶氮苯的新方法.A new method for separating and purifying p - AAB ( p - aminoazobenzene ) by dry - column chromatography is developed.偶氮苯侧链液晶聚合物.Azobenzene side - chain liquid crystalline.必须通过偶氮,(苯)酚类,有机氯试剂,...
Add 20 mg. of diatomaceous earth filter aid per liter of solution.对每升溶液加入20毫克硅藻土助滤剂.Acid - washed, flux - calcinated diatomaceous earth is often used.通常使用酸洗的, 通量煅烧硅藻土.Diatomaceous earths are the skeletal remains of the t...
50年的经验使得他在款式上有自己的独到见解。His 50 years of experience have given him strong convictions about style.有些款式特别衬人，很快就成了经典。Some styles are so flattering that they instantly become classics.她会教你如何搭配款式和颜色。She'll show you how to ...
From beginning to end his conduct had been despicable and wicked.从头到尾他的行为既卑鄙又可恶.They played a shameful [ despicable ] role in this farce.他们在这场闹剧中扮演了可耻 [ 鄙 ] 的角色.Ingratitude is a despicable vice.忘恩负义是可鄙的不道德行为....