20082592 Ding Kuan(Coal Mine Managing Branch Company of Datong mining Industry Group Company,Datong 037003,China) Making Sure of the Slak Cirle of the Rock around the Tunnel by the Spreading Speed of the Earthquake Wa...20082592 Ding Kuan(Coal Mine Managing Branch Company of Datong mining Industry Group Company,Datong 037003,China) Making Sure of the Slak Cirle of the Rock around the Tunnel by the Spreading Speed of the Earthquake Wave in the Rock around the Tunnel(Geology and Prospecting。展开更多
文摘20082592 Ding Kuan(Coal Mine Managing Branch Company of Datong mining Industry Group Company,Datong 037003,China) Making Sure of the Slak Cirle of the Rock around the Tunnel by the Spreading Speed of the Earthquake Wave in the Rock around the Tunnel(Geology and Prospecting。