The focus of this paper is to try to build URT external cost evaluation system.
本文的重心在于，分析评价城市轨道交通的外部成本。
Therefore the establishment of cost accounting and evaluation of heating system is very necessary.
因此建立供热成本核算和评估体系是非常必要的。
Therefore the establishment of cost accounting and evaluation of heating system is very necessary.
因此建立供热成本核算和评估体系是非常必要的。
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