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The coalbed methane pipeline in the west zone of Shanxi Jincheng Anthracite Mining Group constructed by CNPC Daqing Oilfield Con-struction Group was completed on July 24th,half a
The coalbed methane pipeline in the west zone of Shanxi Jincheng Anthracite Mining Group constructed by CNPC Daqing Oilfield Con-struction Group was completed on July 24th, half a