接触性皮炎根据接触物质的不同及其症状特点而有不同的名称，如因漆刺激而引起者称为（）；因贴膏药引起者称为（）
参考答案：漆疮；膏药风
反映事物内部结构特征的指标是
A．率
B．相对比
C．构成比
D．百分位数
E．变异系数
All of the following statements are true about the price-to-sales ratio EXCEPT:（）
A. users of the ratio believe that sales information is subject to less manipulation than any other data item.
B. price-to-sales ratio is fairly constant by industry.
C. advocates of the ratio believe that p sales growth is a requirement for a growth company.
