Hollow iav yog ib hom tshiab ntawm cov khoom siv hauv tsev uas muaj cov thermal rwb thaiv tsev zoo, suab rwb thaiv tsev, kev siv zoo nkauj, thiab tuaj yeem txo qhov hnyav ntawm cov tsev. Nws yog ua los ntawm ob (lossis peb) daim iav, siv lub zog siab thiab siab-airtightness composite nplaum ...
Nyeem ntxiv