Real-time decision making reflects the convergence of several digital technologies,including those conced with the promu......

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......

The outputs of a national economy can be partitioned into three sets of products:tangible goods(due to manufacturing,con......