现在全国各大城市地铁是主要交通工具,方便快捷。上海地铁已经有接近二十条线,还在建设中还有几条线,没想到全国地铁亏损这么严重,让人吃惊,建设地铁成本巨大,从拆迁到施工,需要大量人力财力,见效慢吧?大家怎么看?
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