题目内容
用离子交换树脂提取总生物碱,所选择的树脂类型是
2021-12-28
A.大孔树脂
B.弱酸型阳离子树脂
C.弱碱型阴离子树脂
D.强酸型阳离子树脂
E.强碱型阴离子树脂
试卷相关题目
SQL Error: select id,body,options from ***_enewstiku where sourceid='30303' and id < 2450369 and id<>'2450369' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30303' and id > 2450369 and id<>'2450369' order by id asc limit 5