250kmh有砟客专,声称“预留300kmh”,这种说法是否可信?若可信,如何才能达到预留时速? 知乎 Template




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tomski250kmh有砟客专,声称“预留300kmh”,这种说法是否可信?若可信,如何才能达到预留时速? 知乎 coloring