Yog lawm, cov qhov rooj hluav taws tuaj yeem muaj cov iav panels lossis lub qhov rai, tab sis nws nyob ntawm ntau qhov rooj lossis kev ntaus hluav taws xob yuav tsum muaj. Cov iav no yuav tsum yog cov iav ntsuas hluav taws nrog lub thickness uas phim rau FD ntsuas koj xav tau.
Yog tias koj xav paub ntau ntxiv txog peb cov hluav taws kub lub qhov rooj hluav taws kub qhov rooj thiab cov khoom wood,
