from the change of industry classification standard in 2003 until 2005, the extremes ratio of industrial wage kept ascending but fell in 2007 while the difference between the 「poles」 fell after rose.
从2003年行业划分标準改变到2005年,行业工资极值比继续攀升,但到2007年又有回落的现象,「两极」差距先扩大后缩小。