采用变频调速控制，对风机、水泵类机械进行转速控制来调节流量的方法，对节约能源，提高经济效益具有非常重要意义。
Frequency control the use of fans, water pumps, type of machinery to carry out speed control method to regulate the flow of energy conservation, economic efficiency is very important significance.
保持车辆具有良好的使用性能，减少公害、节约能源、提高运力，充分提高车辆的社会效益和经济效益。
The text suggest that car should keep well useable performance, reduce social effects of pollution, economize energy sources, and well improve society benefit and economic benefit.
这对现有大量的配电线路提高经济运行水平，降低线损，节约能源是有现实意义的。
This is of practical value to promoting economic operation and reducing line losses in distribution lines and thus to energy conservation.
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