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。
Owing to the low economic efficiency and high consumption proportion of agricultural water use, the primary content of worlds water transaction is agricultural water rights shift.
农业是世界水资源最大的使用者，由于农业用水的低经济效益和高消耗比例，世界水权交易的主要内容是农业水权转移。
The effects of water use efficiency and economic benefit of maize under different water and fertilizer groups have been studied.
对不同肥水组合的玉米水分利用效率及经济效益进行了研究。
The study result showed that the water consumption of agriculture was higher, but the water use efficiency was lower, the cost was not economical, the economic benefit was poor;
研究结果表明，黑龙江省农业耗水量最大却效率低下，用水成本高，经济效益差；
On the basis of different water use efficiency and economic incentives among the sectors, this paper points out that water right transactions among the sectors can optimize water resource allocation.
本文在分析水权和水权交易的基础上提出建立一种合约化的水权交易市场模式 ，并对此市场的结构和功能进行了分析。
On the basis of different water use efficiency and economic incentives among the sectors, this paper points out that water right transactions among the sectors can optimize water resource allocation.
本文在分析水权和水权交易的基础上提出建立一种合约化的水权交易市场模式 ，并对此市场的结构和功能进行了分析。
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