多项选择题
High performance liquid chromatography-pre-column derivatization method Aflatoxin B1, B2, G1, G2 solid phase purification column purification to remove interference substances such as ___ to obtain a purification solution.
判断题 A distinct purpose is important in defining an organization. 正确 错误
单项选择题 下列物质碱性由大到小的顺序为：A.苯胺 B.二甲胺 C.氨 D.甲胺 A、ABCD B、BACD C、BCDA D、BDCA
单项选择题 6.无论男士还是女士，出席重要场合，身上哪两种物品的颜色应该一致 A、包与皮鞋 B、皮鞋与皮带 C、包与帽子 D、以上都不对
