自变量中，内部因素包括：企业资产规模、营业利润增长率、企业存续时间、存货水平、流动比率、营业毛利率、带息负债率。
Independent variable , the internal factors included : the scale of corporate assets , operating profit growth , the corporate existence of time , inventory levels , current ratio , operating margin , interest-bearing debt ratio .
营业利润增长率