Notable differences are existed between system service and unit service in urban water affairs operative services and type of property it encounters varies 城市水務運營服務的系統服務和單元服務存在著顯著的區別,其對應的產權形式也各不相同。
A feasibility study is made for the development of water affairs marketization , on the basis of evaluation on system service and unit service and property type 通過對城市水務系統服務和單元服務性質及產權形式的分析,為水務市場化的發展指出了可行之路。
3 . inventory model under uncertainty demand environment , two kinds of service level including unit service level and cycle service level and their relation were studied . the solution to safety factor aimed at minimizing the total cost of inventory was given , therefore , some useable heuristic relation was found by linear regression with simple variable and multi - variables , together with bp neural network methods 討論了從庫存參數變量出發,以庫存成本最低為目標,求得安全庫存的遞推解法,并由此研究了安全庫存因子與參數之間的簡化關系,用單變量和多變量線性回歸及bp網絡方法,比較了三種模擬效果,找到可用的簡化模型關系。