关于色谱法分类的有关知识 A. 以多孔物质为固定相,利用组分分子大小的不同进行分离 B. 在流动相中加入一定浓度的离子对试剂, 使离子型药物得到很好的分离 C. 流动相的极性大于固定相的极性 D. 流动相的极性小于固定相的极性 E. 固定相表面带电荷的基团与试样离子和流动相离子进行可逆交换或吸附实现组分的分离
【单选题】Nancy: Sue, Mum said that her sister is coming to visit us this weekend Sue: Our aunt is coming? That’s great! We haven’t seen her since last Christmas. When will aunt come?
【简答题】Nancy: Sue, Mum said that her sister is coming to visit us this weekend Sue: Our aunt is coming? That’s great! We haven’t seen her since last Christmas. When will aunt come?