净现值大于零说明项目对公司有正的净经济效益。
A net present value of greater than zero indicates that the project has positive net economic benefit to the company.
最大净现值标准——资源应该分配成具有利用最大价值，如果从所有可能利用的资源中收获净效益。
Maximum net present value criterion — Resources should be allocated to those USES which maximize the value if the net benefits received from all possible USES of those resource.
之后，对灌溉效益特点进行深入地分析，并使用模拟方法，以经济净现值为指标对研究区的农业灌溉方案的经济效益进行模拟求解。
After these, this paper analyses the features of irrigation benefits, and calculates the average benefit of every scheme with simulated method, using Economic Net Present Value.
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