己内酰胺装置离子交换树脂再生所用的再生剂是（）。
A、盐酸、甲醇
B、硝酸、烧碱
C、硫酸、烧碱
D、盐酸、烧碱
参考答案：B
It is reported that many a new house ________ at present in the disaster area. [ ]
A. are being built
B. is building
C. are building
D. is being built
醇胺型小檗碱的碱性强是因为其具有（）结构，其氮原子上的孤电子对与α-羟基的C—O单键的б电子发生转位，形成（）。
