... 定期维修制 plan-based maintenance 国土开发型铁路 land-developing railway 苍蝇 fly ...
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Establishing an index system and scaling the weight of every index reasonably is an effective way to evaluate the investment estimation of the land-developing railway, which have an obvious external.
构建指标体系，合理确定各指标的权重系数，是量化评价外部性显著的国土开发型铁路的可行思路之一。
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