Muaj ntau yam qauv rau lub suab thaiv tam sim no, tab sis peb qhia lawv feem ntau ntawm cov khoom siv, cov duab, thiab cov tsos.Cia peb saib.(1) Cov khoom siv suab nrov suav nrog: cov khoom siv hlau, cov khoom siv fiberglass, xim hlau phaj, PC board, txhuas ua npuas ncauj, txhuas phaj.Vim peb tau siv ...
Nyeem ntxiv