一百年也更新換代不了一回的東西,還是運營成本更重要吧?人口密度極高的地方,高鐵能賺錢
回答: 高鐵和航空的一個區別是upgrade的難易和成本。高鐵要upgrade很困難,不僅要upgrade列車,也要upgrade全線
由 Porcelana
於 2018-07-01 20:23:39
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