5-A1 2,4,6-Tribromanilin aus Anilin 5-A2 2-Amino-4’-nitrobiphenyl aus 2-Aminobiphenyl 5-A3 Bis(4-methoxyphenyl)phenylmethylchlorid ausBenzotrichlorid und Anisol
A1 型 题(1071~1192) 1071.The proportion of gastroesophageal reflux symptoms in the general populaton is: A.1%~8% (易、记忆) B.7%~15% C.14%~22% D.21%~29% E.28%~36%