题目内容

Section BDirections: There are 5 incomplete statements here. You should fill in each blank with the proper form ofthe word given in brackets. Write the word or words in the corresponding space on the AnswerSheet.31. What we're trying to do is to have companies (manage)_______and use plastic much more wisely.

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生物碱的沉淀反应条件是( )

A. 酸性有机溶剂
B. 酸性水溶液
C. 碱性水溶液
D. 碱性有机溶液

生物碱的碱性表示方法多用( )

A. kb
B. pkb
C. ka
D. pka
E. PH

碱性最强的生物碱类型为( )

A. 酰胺生物碱
B. 叔胺生物碱
C. 仲胺生物碱
D. 季铵生物碱
E. 两性胺生物碱

麻黄碱中氮原子的杂化方式为( )

A. sp3
B. sp2
C. sp
D. 不等性sp3
E. 不等性sp2

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