In this essay,we wish to make a single,simple argument.That is,if in- formation problems are the primary root of the acc......

为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7......

Relocation of the Yellow River estuary has significant impacts on not only terrestrial environment and human activities,......

对向量组的Schmidt正交化法和合同变换法的关系进行了分析,指出Schmidt正交化法就是合同变换法中利用规范化初等变换后的一种特殊......