1.Mechanical polishing Mechanical polishing yog ib txoj kev polishing uas tshem cov polished convex qhov chaw los ntawm kev txiav thiab yas deformation ntawm cov khoom nto kom tau ib tug du nto.Feem ntau, oilstone strips, wool log, sandpaper, thiab lwm yam yog siv, feem ntau yog phau ntawv ua haujlwm, thiab tshwj xeeb p ...
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