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年行业划分标准改变到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。
Companies were all assigned a numerical Standard Industrial Classification (SIC) code (now North American industry Classification System, or NAICS) identifying which industry sector they fit in to.
每个企业都会有一个标准产业代码(SIC)(现为北美产业分类系统，简称NAICS)，用来确定各自属于哪个产业部门。
It focused on classification, effective range, way of execution and characteristic of chemical industry standard.
对化工标准的分类、有效范围、执行方式以及化工标准的特点作重点论述。
It focused on classification, effective range, way of execution and characteristic of chemical industry standard.
对化工标准的分类、有效范围、执行方式以及化工标准的特点作重点论述。
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