名义规格实际尺寸长度规格等级  （英寸） (cm)(米)   5/4*4 2.5*8.9 4.27 外观一级 5/4*6 2.5*14.0 4.27 外观一级 2*4 3.8*8.9 3.05/3.66/4.27/4.88 结构一级 2*6      3.8*14.0 3.05/3.66/4.27/4.88 结构一级 2*8 3.8*18.4 3.05/3.66/4.27/4.88 结构一级 2*10 3.8*23.5 3.05/3.66/4.27/4.88 结构一级 2*12 3.8*28.6 3.05/3.66/4.27/4.88 结构一级 4*4 8.9*8.9 3.05/3.66/4.27/4.88 结构一级 4*6 8.9*14.0 3.05/3.66/4.27/4.88 结构一级 4*8 8.9*18.4 3.05/3.66/4.27/4.88 结构一级 6*6 14.0*14.0 3.05/3.66/4.27/4.88 结构一级 8*8 20.3*20.3 3.05/3.66/4.27/4.88 结构一级 10*10 25.4*25.4 3.05/3.66/4.27/4.88 结构一级 12*12 30.5*30.5 3.05/3.66/4.27/4.88 结构一级
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