问题
单项选择题 A1/A2型题
异烟肼与香草醛反应，干燥后测定其熔点为（）
A.248～251℃
B.208～211℃
C.218～221℃
D.228～231℃
E.238～241℃
答案
参考答案：D
解析：异烟肼与香草醛反应，干燥后测定其熔点为228℃～231℃。
搜题请搜索小程序“爱下问搜题”
异烟肼与香草醛反应，干燥后测定其熔点为（）
A.248～251℃
B.208～211℃
C.218～221℃
D.228～231℃
E.238～241℃
参考答案：D
解析：异烟肼与香草醛反应，干燥后测定其熔点为228℃～231℃。
| 完形填空 | ||||
| Sonia: Hi! Mary: 1 ! Sonia: Is this your notebook? There isn't a name on it. Mary: No, 2 . Sonia: Are you sure? 3 is your notebook? Mary: Oh, it's on the desk. Sonia: Is this 4 notebook? Mary: I think it is 5 notebook. Let's ask 6 . Maria ! Maria: 7 ? Mary: Is this your notebook? Maria: Let me see. Oh, yes, it is 8 notebook. Mary: Oh, good, but please write down your name on it. By the way, where is the teachers' office? Maria: 9 way, please. Mary: 10 . | ||||
|