#China has begun construction of its domestically built largest-diameter （13.2-meter-diameter） open-type hard rock tunnel boring machine (#TBM), equipped with a homegrown 7600-type #rare-earth special steel main bearing, in East China’s Jiangsu Province on Friday, marking the

#China has begun construction of its domestically built largest-diameter （13.2-meter-diameter） open-type hard rock tunnel boring machine (#TBM), equipped with a homegrown 7600-type #rare-earth special steel main bearing, in East China’s Jiangsu Province on Friday, marking the

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