某砂样经筛分试验，各筛上的筛余量见下表，试计算其细度摸数并确定其粗细程度（即判断其为粗砂，中砂，细砂还是特细砂）筛孔尺寸(mm)5.02.51.250.630.3150.16<0.16筛余质量(g)27.54247191.5102.5827.5筛孔尺寸(mm)5.02.51.250.630.3150.16<0.16筛余质量(g)27.54247191.5102.5827.5筛孔尺寸(mm)5.02.51.250.630.3150.16<0.16筛余质量(g)27.54247191.5102.5827.5筛孔尺寸(mm)5.02.51.250.630.3150.16<0.16筛余质量(g)27.54247191.5102.5827.5筛孔尺寸（mm）5.02.51.250.630.3150.16<0.16筛余质量（g）2080100100758540