General special color printing commonly used for the following three color printing, if need to more than four color printing, chooses CMYK printing is advisable.
一般专色印刷通常用于三色以下的印刷，假如需要四色以上的印刷，则选用CMYK四色印刷为宜。
Universal bag printing standard size three open, four open four-color or three. Each kind is divided into two kinds of positive degree or degree.
通用的手提袋印刷标准尺寸分三开，四开或对开三种。每种又分为正度或大度两种。
Printing effect research include three parts: printing gloss, color density and color deviation, color efficiency, gray level.
对印刷效果的研究包括三个方面：印刷光泽度、色密度和色偏、色效率、灰度。
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