4x4x6的甄选

&nbsp&nbsp&nbsp4×4×6角铁有14.32kg。&nbsp&nbsp&nbsp按我国制造标准，4x4x6米角铁标准标记∠40×40×4，长度6000，理论重量计算如下：&nbsp&nbsp&nbsp钢、铁比重为7850kg/m³，角钢重量＝净体积×比重＝（2*40-4）/1000*4/1000*6000...