✔ 最佳答案
要睇咩物料同埋咩用途唔可以一慨而論,一般有以下方法。
Mechanical polishing (pros: suitable on various kinds of material, cons: expensive for large production)
anodizing / electro-plating (Pros: perfect surface, cons: the original surface is covered, environmental problem)
electro-polishing (pros: perfect for surface examination, cons: difficult to control without expensive machine, environmental problem)
chemical polishing ( same as eletro-polishing)