Dav dav flange beam tseem hu ua H-beam vim lawv cov duab sib txawv, zoo ib yam li tsab ntawv "H" thaum saib ntawm ntu ntu. Cov duab no muaj txiaj ntsig zoo rau kev nqa cov khoom hnyav yam tsis muaj kev khoov.
Xov xwm
Lub npe H Beam yog dab tsi?
Nov 06, 2023
Tso lus
Xa kev nug