型號規格mm堆積個數no./m3比表面積m2/m3空隙率%干填料因子M>-1Dg1616×8×0.429000024092300Dg2525×12.5×0.59716022093273.5Dg3838×19×0.631890154.394185.8Dg5050×25×0.812600109.295127.4Dg7676×38×1.034209097112.4