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。
The external-driven method is attractive for its simplicity and low cost.
外驱动同步整流方案具有电路实现简单，电路成本较低等优点。
The external-driven method is attractive for its simplicity and low cost.
外驱动同步整流方案具有电路实现简单，电路成本较低等优点。
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