The following are major difficulties in building the Qinghai-Tibet railway, except （）.
A.fragile ecological environment
B.hypoxia
C.tundra
D.lack of personnel
正确答案：lack of personnel
The following are major difficulties in building the Qinghai-Tibet railway, except （）.
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The world’s largest and deepest underground high-speed railway station has beenbuilt 102 meters beneath the Great Wall at the （）
The average altitude of the Qinghai-Tibet Plateau is （）.
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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.
- Thanks to the unremitting efforts of engineering and technical personnel like Zhang Luxin and construction teams, the Qinghai-Ti
- The average altitude of the Qinghai-Tibet Plateau is （）.