以下对盐酸麻黄碱描述不正确的是()
A.不含酚羟基
B.有两个手性碳
C.1S,2S-异构体活性最强
D.游离麻黄碱具强碱性
E.可预防哮喘发作和治疗鼻塞
参考答案:C
---- Susan, go and join your sister cleaning the yard.
---- Why ____? John is sitting there doing nothing.
A.him
B.he
C.I
D.me
歌剧《魔弹射手》