The following are major difficulties in building the Qinghai-Tibet railway, except （）.
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
Tag：中外铁路文化之旅
时间：2022-01-14 21:32:25