下列各类生物碱碱性最强的是
A.脂氮杂环
B.芳氮杂环
C.芳胺类
D.酰胺类
E.季铵类
参考答案:E
解析:季铵碱的碱性最强。
It is important to ________ the latest research. [ ]
A.keep in touch with
B.lose in touch with
C.be out of touch with
D.get in touch with
非法猎捕、收购贩卖,濒危类隼类的,情节严重的标准是6只,特别严重的标准是()