Dab tsi yog qhov yuav tsum muaj rau lub qhov rooj hluav taws

Qhov rooj thiab thav duab yuav tsum tau ua. Ntoo cov nplaim hluav taws yuav tsum muaj cov ntoo ntoo lossis cov ntxhia pob zeb, thaum cov qhov rooj hlau loj muaj feem ntau muaj cov khoom siv honeycombed lossis insulated cores. Lub qhov rooj yuav tsum tau npaj ua ntej ntawm lub hoobkas yog li tsis muaj ntau tshaj li peb-ntu ntawm ib nti ntawm kev tshem tawm hauv qab ntawm lub qhov rooj thiab tiav pem teb.