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...
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....