盐酸普鲁卡因具有的性质为()。
A. 与芳醛缩合成席夫碱
B. 具重氮化-偶合反应
C. 羟胺侧链具碱性
D. 具有酯键可水解
E. 具有芳伯氨基
盐酸利多卡因在酸性溶液中与氯化钴试液反应,生成亮绿色的细小钻盐沉淀
A. 对
B. 错
The first paragraph of the parents’ letter has a_________
A. tragic tone.
B. prideful tone.
C. pleading tone.
In its third paragraph, the parents’ letter takes on a _______
A. distressed tone.
B. revengeful tone.
C. doubtful tone.