型號規格mm堆積個數N0./m3比表面積m2/m3空隙率%干填料因子M>-1>Dg2525×9×0.514800022893.6287Dg3838×12.7×0.74600015095175Dg5050×17×0.81950011596.5140Dg7675×22.5×150008897.5112
