差额内部收益率 meaning in Chinese

differential internal rate of return

The economic methods such as cpv ( cost present value ) , airr ( internal rate of return ) and c - b ( cost - benefit ) are adopted to judge the projects
在技术经济评价中，本文采用了费用现值法、差额内部收益率法和费用?效益分析法等经济学方法对各方案进行了比较分析。
2 . the condition of choosing steel spheres and backing sheet matching scheme is economical and reasonable firstly . in other word , when airr is bigger than i , cpv is more small and more economical
2球磨机钢球和衬板匹配方案选用的条件首先是经济合理，即在差额内部收益率大于基准折现率的基础上，费用现值越小越经济。