题目内容
纯化和富集生物碱的水提液,首选的离子交换树脂是
2021-12-28
A.强碱性阴离子树脂
B.弱碱性阳离子树脂
C.强酸性阳离子树脂
D.弱酸性阴离子树脂
E.大孔树脂
试卷相关题目
SQL Error: select id,body,options from ***_enewstiku where sourceid='30298' and id < 2449878 and id<>'2449878' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30298' and id > 2449878 and id<>'2449878' order by id asc limit 5