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.
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。
The incentive mechanism of taxes and fees is one of the popular method which use the economic way to control the fishing effort and protect the fishery resource in the world wild.
税费激励是近年来国际上流行的用经济手段控制捕捞力量和保护渔业资源的盛行方法之一。
Abstract: By theoretical inference and calorific value calculation method, theoretical economic ratio of making use of propane gas is found out.
文摘：采用理论推导和热值计算法，可求出使用丙烷气的理论节约率。
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