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本文旨在研究埃塞俄比亚中部Angacha地区树篱中的鸟类多样性.采用样线法及样点法调查了五个子地点的鸟类多样性、丰富度、相似度及......
Effectiveness of sloping agricultural land technology on soil fertility status of mid-hills in Nepal
Data Envelopment Analysis(DEA) is a mathematical technique to assess relative efficiencies of decision making units(DMUs......
