Cov sub-cheebtsam suav nrog khi cov pas nrig, purlins, struts Thib ob, cov sub-tivthaiv kuj muaj cov haujlwm tseem ceeb. Piv txwv li, purlins nqa cov haujlwm theem nrab hauv lub ru tsev. Raws li ib qho tseem ceeb ntawm lub ru tsev qauv ntawm cov nroj tsuag, tus khi hlua yog tsuas yog lub zog ua kom tsis txhob muaj axial quab yuam thiab av qeeg, thiab yog tus ncej ntawm lub seismic tiv taus ntawm cov nroj tsuag.
Lub luag haujlwm ntawm cov hlau theem nrab hauv cov qauv hlau
Apr 07, 2025
Tso lus