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Foreign Wheat Germplasm Investigation, Introduction and Utilization in Ningxia Urbanization expanding process and its spatial characteristics in Changping District of Beijing,China The expanding characteristics study of built-up land use along the urbanization gradient in quickly urbanized area:a case study of Nanchang area SMALL-SCALE Co SOURCE SHEILDING EXPANDING AND ITS ENVIORNMENTAL ASSESSMENT Impacts of urban landscape structure on urban sprawl: A case researches in Nanchang