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Ⅰ.INTRODUCTIONNorth China platform extends beyond Yinshan Mountains in the north,beyond HelanMountains in the west,to Qilian Mountains,Qinling Mountains,Funiu Mountains and DabieMountains in the south,and to the sea in the east.It covers the whole or part of Gansuprovince,Shannxi province,Ningxia Autonomous Region,Inner Mongolia Autonomous Re-gion,Shanxi province,Hebei province,Shandong province,Liaoning province,Jilin prov-ince,Jiangsu province,Anhui province,Henan province,Beijing Municipality,Tianjin
I.INTRODUCTIONNorth China platform extends beyond Yinshan Mountains in the north, beyond HelanMountains in the west, to Qilian Mountains, Qinling Mountains, Funiu Mountains and DabieMountains in the south, and to the sea in the east. It covers the whole or part of Gansuprovince , Shannxi province, Ningxia Autonomous Region, Inner Mongolia Autonomous Re-gion, Shanxi province, Hebei province, Shandong province, Liaoning province, Jilin prov-ince, Jiangsu province, Anhui province, Henan province, Beijing Municipality, Tianjin