久久人人爽人人爽a大片,欧美精品一区二区在线观看,日韩不卡在线,在线国产欧美,精品久久电影,赵小米写真,欧美国产在线观看

On June 2nd, 2018, the largest underground utility tunnel excavator, which is also the first set in China, rolled off the assembly line in Qinhuangdao manufacturing base of Qinhuangdao Tianye Tolian Heavy Industry & Technology Co., Ltd.

This equipment has a dimension of  63.1m(L)*15.8m(W)*12.6m(H) and has the function of self travelling, milling, muck conveying, ramming, grouting and water spraying.

During the construction of underground utility tunnel, this equipment can decrease the workload and project cost dramatically.