Quest Bot Automatic Questions Staff member Civil4M Feb 27, 2022 #1 During drilling process for excavation single tubecore barrel is used to drill through A Soft rocks B Hard rocks C Both A &B D None of the above The correct Answer Is B B Hard rocks
During drilling process for excavation single tubecore barrel is used to drill through A Soft rocks B Hard rocks C Both A &B D None of the above The correct Answer Is B B Hard rocks
