Casting polyurethane cov ntaub ntawv

Raws li ib qho ntawm cov coj ua caste casting polyurethane cov ntaub ntawv chaw tsim tshuaj paus hauv Suav teb, peb sov siab txais tos koj mus yuav siab {}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}} Cov ntaub ntawv ua nyob rau hauv Suav teb no los ntawm peb lub hoobkas. Tag nrho peb cov khoom yog nrog cov khoom zoo thiab cov nqi sib tw. Yog xav paub ntxiv, tiv tauj peb tam sim no.