1) Npaj Tiv thaiv cov seams ntawm lub qhov rooj, qhov rais thav duab, rooj tog zaum, paint.etc nrog cov ntawv xim.Tsis tas li ntawd, cov khoom siv ntoo, cov khoom sib faib thiab lwm cov rooj tog zaum yuav tsum tau them nrog cov ntawv xov xwm kom tsis txhob muaj xim tha xim thiab staining.2) xim sib xyaw Rau cov phab ntsa uas xav tau ib qho tshwj xeeb colo ...
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