Thanks to the unremitting efforts of engineering and technical personnel like Zhang Luxin and construction teams, the Qinghai-Ti

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• The Qinghai-Tibet Railway is the World’s fastest train on Permafrost.
• The total length of the Qinghai-Tibet Railway is 1,756 kilometers.
• The average altitude of the Qinghai-Tibet Plateau is （）.
• The following are major difficulties in building the Qinghai-Tibet railway, except （）.