Hauj lwm lawm
Kev tsis
1.Qhov zoo
Cov khoom no yog txau nrog dawb txhuas laj kab. Cov xim ntawm cov khoom tuaj yeem hloov pauv lossis ua rau hauv qhov chaw oxidation. Yog xav paub ntxiv, thov sab laj kom ntxaws
2.Yuav tsum tau hais
1. Koj yuav tsum muab tag nrho cov duab kos, qhov zoo tshaj plaws DWG cov ntaub ntawv
2. Qhia rau peb txog cov xim thiab cov txheej txheem uas koj xav tau
3. ntev
