n.净费用收益 ratio of discounted net benefit to cost: 净收益贴现值对成本比率net benefit: 净利益; 净效益cost benefit: 成本收益; 成本效益cost-benefit: 成本效益的; 效益分析net cost: 净成本;成本净额;费用净额; 净价下载手机词典可随时随地查词查翻译