机械磨版：用磨擦粉剂，喷沙等机械方法把金属片的表面造成粗糙，适合为柯式印刷。
Mechanical graining: Mechanically roughening the surface of a metal sheet by means of abrasive powders, sand bursting, etc, for use as an offset plate.
机械磨版：用磨擦粉剂，喷沙等机械方法把金属片的表面造成粗糙，适合为柯式印刷。
Mechanical graining: Mechanically roughening the surface of a metal sheet by means of abrasive powders, sand bursting, etc, for use as an offset plate.
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