lt yuav siv qhov tseeb Venlo iav tsev cog khoom nrog lancet arch uas tau them los ntawm cov iav tempered nrog lub teeb xa hluav taws xob ntau dua 90% thiab qhov cua qhov chaw npog 60%.High quality aluminium alloy tau siv rau lub qhov rooj, qhov rais thiab rafters.