“He was an encyclopedic scientist as great as Leonardo， Democritus， Aristotle.” -- Dr. Stuart Munro， a famous British sci......

Shannon and Christine were at an 18th birthday party in Northern Ireland. It was nearly 3 am and time to go home， anyone ......

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研究目的:发现土地整理项目存在的问题,改进工作,提高土地整理项目效益.研究方法:实地调查法,文献资料法,总结归纳法.研究结果:中......

【目的】分析海河流域农田氮磷面源污染及对水质影响的空间分布特征,并识别关键源区,以期为该流域面源污染治理提供参考依据。【方......