多用炒黄法炮制的药物种类是（）
A.根类
B.茎类
C.种子类
D.花类
E.叶类
参考答案：C
数据库的完整性规则分为三类,它们是【 】完整性规则、参照完整性规则和用户定义的完整性规则。
If an increase in aggregate demand is greater than expected, actual inflation is:（）
A. greater than expected inflation and unemployment increases.
B. less than expected inflation and unemployment decreases.
C. greater than expected inflation and unemployment decreases.
