Yog li cas heavy steel structure (qhov khoob loj thiab nyuaj) yog qhov tseem ceeb rau cov ntoo siab?
Kawm txog yuav li cas heavy steel structure yog qhov tseem ceeb rau cov ntoo siab—nws muaj qhov zoo dua rau qhov ntsuas ntawm qhov nyuaj thiab qhov loj, nws tuaj yeem tiv thaiv qhov chaw tsis zoo thiab muaj 15% ntau dua qhov chaw uas tuaj yeem xa. Kawm txog yuav li cas nws zoo dua rau concrete. Nkag mus saib qhov vam tshais tom qab.
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