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20工字钢标准?

20工字钢标准?

20a号工字钢规格:

h=200mm,b=100mm,d=7mm,t=11.4mm,t=9mm,r1=4.5mm

20b号工字钢规格:

h=200mm,b=102mm,d=9mm,t=11.4mm,t=9mm,r1=4.5mm