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凹版印刷方式印版的图文部分低于空白部分，印刷原理类似于阴文印章。凹版印刷分为雕刻凹版、电镀凹版及照相凹版等，其印制品墨层厚实、颜色鲜艳、饱和度高，? https://anitadnak248719.wikipresses.com/4596962/detailed_notes_on_出海导航

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