1. Mechanical Polishing Mechanical polishing yog kev vam khom rau kev txiav, yas deformation ntawm cov khoom siv kom tshem tawm qhov convex ntawm polished nto thiab tau txais cov txheej txheem du nto polishing, feem ntau siv cov roj zeb strips, wool log, sandpaper, thiab lwm yam. , feem ntau yog siv tes ua, ...
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