聚酰胺柱色谱分离下列化合物时，用不同浓度乙醇从低到高洗脱，最先洗脱的成分是

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='30715' and id < 2474715 and id<>'2474715' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30715' and id > 2474715 and id<>'2474715' order by id asc limit 5