WebDec 8, 2008 · 1 尺寸及允许偏差. 工字钢的截面图示及标注符号如图1所示。. 2) 工字钢的尺寸、截面面积、理论重量及截面特性参数应符合表1的规定。. 注:截面图和表中标注的圆 … http://www.xuejixie.com/biaozhunjian/10.html
30工字钢一米有多重_百度问一问
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型钢_百度百科
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