毛茸茸xxxx_国产精品77_91精品国产综合久久福利_日本一级色片_欧美一级黄色录像片_一级久久久久久

On Sept. 5th, the technical exchange delegation from the Serbia department of transport and the Serbian railway company visited the construction site of Lianyugang-Zhenjiang high-speed railway to observe the rail laying and rail welding technology of Chinese railways.

Lianyugang-Zhenjiang high-speed railway is 305 km and has 16 stations. At the track laying construction site of Gaoyou bridge constructed by the China Railway 17th Bureau Group Co., Ltd. , the UN5-150ZB1 flash rail welding machine carried out seamless welding operation and welded the 100-meter rail into a whole long rail, which opened the eyes of Serbian experts.