Cov khoom siv ntawm qhov qhib lub taub hau puag ncig dig muag rivets yog dab tsi?

Cov khoom siv tau:

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