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ADD: NO.1 Kuaileli, xiaolongkang Steet,Shapinaba District, Chongqing china; M: +86-15823195830 QQ:1317425182 Dril hole dia.(mm) 110 (soil) 91 75 60 45 Drilling depth(m) 5-10 10-15 15-20 20-25 30 Drill ...