Dab tsi yog cov khoom siv ntau yam ntawm qhib lub taub hau qhov muag tsis pom rivets?

Cov khoom siv ntau yam:

Cov khoom ua haujlwm ua los ntawm cov duab los qhia, plywood, fiberglass board, asbestos board, yas, roj hmab phaj, hlau phaj thiab lwm yam ntaub ntawv tuaj yeem txuas thiab ua ke.