Fill in the blank with the appropriate form of the verb.1. He was low-spirited and even considered (go) away.
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1. The goods _____________ when we arrived at the airport.
A. were just unloading
B. had just been unloading
C. had just unloaded
D. were just being unloaded
下列药物中可用重氮化-偶合反应及三氯化铁反应进行鉴别的是( )
A. 阿司匹林
B. 对氨基水杨酸钠
C. 青霉素
D. 盐酸普鲁卡因
E. 对乙酰氨基酚
《中国药典》(2015年版)中鉴别()药物利用了芳香第一胺类反应。
A. 苯甲酸
B. 水杨酸
C. 阿司匹林
D. 对氨基水杨酸钠
E. 泛影酸
苯甲酸钠与三氯化铁试液作用生成碱式苯甲酸铁盐,其颜色是( )。
A. 紫色
B. 蓝紫色
C. 紫红色
D. 绿色
E. 赭色