题目: 下面有关皂苷提取分离方法的说法中,错误的是()A.醇提取物经乙醚脱脂后,正丁醇萃取得总皂苷B.酸性皂苷常采用酸提取碱沉淀方法C.皂苷可以用胆固醇沉淀法加以纯化D.与皂苷形成复合物的固醇结构中应有C-β-羟基E.呋甾烷醇类皂苷不能和胆固醇形成沉淀 答案: 参考答案:B
题型:选择题 —Could you please tell me something about the two _______?—_______. They are exchange students of No. 1 Middle School. [ ]A. Frenchmen; Yes, please B. Frenchmans; Come on C. Germen; Not at all D. Germans; All right 查看答案