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......

针对由风险中性的供应商和零售商组成的供应商管理库存（VMI）二级供应链，考虑市场需求随库存展示影响，系统中存在过期成本，建立VMl分散式......

Background: Routine lung function testing requires expensive equipment, or requires maximum expiratory effort. The airfl......

In recent years,food safety accidents resulted from reverse flow of expired foods is of frequent occurrence. Therefore,f......