“vacuum printing frame”的概念、定义、翻译、参考文献-科学参考

单词	vacuum printing frame
释义	vacuum printing frame [`vak·yǝm `print·iŋ ´frām] ^{GRAPHIC ARTS} A frame employed in the graphic arts to keep materials flat or to keep them in absolute contact with one another; the frame is useful in making positives, contact prints, screened tints, and plates.
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