I-profile /I-beam, H-beamthiab cov kab teeb thoob ntiaj teb tseem yog qee qhov tseem ceeb tshaj plaws hauv kev tsim kho niaj hnub no thoob plaws ntiaj teb. Nto moo rau lawv qhov sib txawv "I" duab hla-section, I beams muab ntau lub zog, kev ruaj khov thiab kev hloov pauv tau yooj yim, ua rau lawv tsim nyog rau kev siv hauv cov tsev siab, kev lag luamlub tsev hlauthiab cov choj.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-19-2025