Kuv-beam
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Tus qauv beam I-beam ASTM kub dov carbon steel I-beam
I-beam, tseem hu ua steel beam, yog ib qho sawb hlau nrog I-puab seem.I-beam muab faib ua kub dov I-beam thiab lub teeb I-beam.Nws yog ib feem steel nrog I-shaped seem.
