With the low efficiency, the traditional procurement method leads to the increase of operating cost, the extending period, the lacking of the control on the procurement, and doesn’t build the scale economic.

传统的建筑采购业务效率不高,导致企业运营成本增加,采购周期延长,缺乏对采购的有效控制,无法形成采购中的规模经济效益。

The Optimal Control plays an important role in water supply systems. Much operating cost can be saved through a reasonable Control scheme.

给水管网经济调度在供水系统中作用重大，合理的调度方案可以节约大量的运行费用。

The technique-economics analysis to Subway Waste Heat-Ground Source Heat Pump is made, economic parameters such as initial capital, annual operating cost, annual total cost, net present value, net present value ratio and static recovery period of initial cost are analyzed.

对设计的地铁废热-土壤源混合式热泵系统进行了技术经济性分析,计算了初投资、年经营成本、年总成本、财务净现值和净现值率、静态投资回收期。

To construct tunnels submarine under constant high water head, rationality and reliability of waterproof and drainage system is the key to succeed and the main contents of control operating cost.

要在具有恒定高水头的海底修建隧道,防排水系统的合理性和可靠性是成功的关键,也是控制运营费用的主要内容。