用异羟肟酸铁反应检识香豆素时,反应条件是() A.碱性 B.先碱性,后酸性 发布时间:2017-06-04 19:09 │ 来源:www.tikuol.com 题型:单项选择题 问题: 用异羟肟酸铁反应检识香豆素时,反应条件是()A.碱性 B.先碱性,后酸性 C.酸性 D.先酸性,后碱性 E.中性
题型:单项选择题 — Your mum is very kind. — Yeah, My mum is pretty considerate, you know what _____, she always arranges everything around me. [ ]A. she meansB. you meanC. I mean D. we mean 查看答案