According to the new classification system , the analytic hierarchy process is used to evaluate quantitatively the attribute types , the preponderant resources and the grade conditions of the ecotourism resources which belong to 245 tourism resource units in the county of ningwu 根据新的生态旅游资源分类分级系统，运用层次分析方法对宁武县生态旅游资源( 245个旅游资源单体)的属性类型、优势资源的赋存和等级情况进行了定量评价。
The loss with time was put forward to value dispersion . the second part is about classifying the super - fine powder . due to the abrasive grain being hard , seriously wearing the equipment and requiring the narrow - grade , a new - type of vertical multistage waterpower system was developed 针对磨料硬度大对分级设备磨损严重、磨料微粉属于窄粒级分级产品而设计出一种新型垂直式多级水力分级系统，该系统主要特点： 1 、垂直式多级分级。
