Based on the analysis to several usual operations in data base application system, the optimized strategy on how to construct SQL sentence to improve operation speed is studied in this paper.
本文通过分析数据库应用系统中常见的几种运算，提出了如何构建SQL语句，才能达到运算的优化，提高系统运行速度。
After the renovation on coal gasification process and equipment, the operation of the system is optimized and the energy consumption is reduced.
通过对造气系统工艺流程及设备进行改造，达到了优化系统运行及节能降耗的目的。
Monitoring and control the material levels of tube mill validly is the key of optimized operation, energy-saving and consumption-reducing in pulverized coal system.
有效的监测及控制低速钢球磨煤机的料位，是制粉系统实现优化运行、节能降耗的关键。
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