单选题:用聚酰胺柱色谱分离下列黄酮类化合物,乙醇–水进行洗脱,出柱的顺序为( ) 题目分类:中药学专业知识(二) 题目类型:单选题 查看权限:VIP 题目内容: 用聚酰胺柱色谱分离下列黄酮类化合物,乙醇–水进行洗脱,出柱的顺序为( ) A.单糖苷–双糖苷–三糖苷–苷元 B.苷元–单糖苷–双糖苷–三糖苷 C.三糖苷–苛元–单糖苷–双糖苷 D.苷元–双糖苷–三糖苷–单糖苷 E.三糖苷–双糖苷–单糖苷–苷元 参考答案: 答案解析:
凝胶过滤法的洗脱顺序为( ) 凝胶过滤法的洗脱顺序为( )A.极性小者先洗脱下来 B.极性大者先洗脱下来 C.分子最大者先洗脱来 D.分子量小者先洗脱下来 E.羟基数日少者先洗脱下来 分类:中药学专业知识(二) 题型:单选题 查看答案
--Who lives in this room?-- _________. --Who lives in this room?-- _________.A.[ A ] Not B.[ B ] No one C.[ C ] No D.[ 分类:中药学专业知识(二) 题型:单选题 查看答案
Mrs. Smith is _________mother. Mrs. Smith is _________mother. A.[ A ] Lucy and Lily B.[ B ] Lucy's and Lily's C 分类:中药学专业知识(二) 题型:单选题 查看答案
I'd like to buy a house--modern, comfortable, and_________ i I'd like to buy a house--modern, comfortable, and_________ in a quiet neighborho 分类:中药学专业知识(二) 题型:单选题 查看答案
Mary kept weighing herself to see how much_________ she was Mary kept weighing herself to see how much_________ she was getting.A.[ A ] heav 分类:中药学专业知识(二) 题型:单选题 查看答案