某含氮有机物C4H9NO2有多种同分异构体,其中属于氨基酸的异构体数目有 [ ] 发布时间:2017-06-18 22:39 │ 来源:www.tikuol.com 题型:不定项选择题 问题: 某含氮有机物C4H9NO2有多种同分异构体,其中属于氨基酸的异构体数目有 [ ]A.3种 B.4种 C.5种 D.6种
题型:不定项选择题 — Did Frank call you yesterday?— Yes, but I would rather he ________. [ ]A. not B. hadn't C. didn't D. wouldn't 查看答案