Mbiri ya I /I-beam, Mzere wa Hndipo matabwa achilengedwe akadali ena mwa zinthu zofunika kwambiri pa ntchito zomanga masiku ano padziko lonse lapansi. Ma matabwa a I amadziwika ndi mawonekedwe awo apadera a "I", amapereka mphamvu zambiri, kukhazikika komanso kusinthasintha, zomwe zimapangitsa kuti akhale oyenera kugwiritsidwa ntchito m'nyumba zazitali, m'mafakitale.nyumba yopangira zitsulondi milatho.
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Nthawi yotumizira: Novembala-19-2025