石筛筛孔的工程直径与方孔筛尺寸(mm)石的公称粒径石筛筛孔的公称直径方孔筛筛孔边长2.502.502.365.005.004.7510.010.09.516.016.016.020.020.019.025.025.026.531.531.531.540.040.037.550.050.053.063.063.063.080.080.075.0100.0100.090.0碎石或卵石的颗粒级配范