1. Kev npaj rau kev tshem tawm xeb ua ntej pleev xim, qhov saum npoo ntawm cov qauv hlau yuav tsum tau muab tshem tawm los ntawm cov roj, plua plav, xeb, oxide thiab lwm yam ntaub ntawv, kom lub npoo yuav tsum tau coated yog huv si, qhuav thiab tsis muaj kuab paug.Roj thiab pleev xim rau ntawm qhov chaw ntawm ...
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