线式齿(line perforation)： 用线式打孔器在整张邮票上打成的齿孔称线式齿。该打孔的方式是一行一行地来完成邮品全张上每一枚票品之齿孔的。
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Middle Line Perforation Dropped 中缝漏齿
Horizontal Line Perforation Dropped 横缝漏齿
Vertical Line Perforation Dropped 直缝漏齿
Vertical Middle Line Perforation Dropped 直中缝漏齿
Horizontal Middle Line Perforation Dropped 横中缝漏齿
Ventical Line Perforation Dropped 直缝漏齿
single line perforation 单线轧齿
Horizontal Line Perforation Dro ed 横缝漏齿
line perforation
线穿孔
以上为机器翻译结果，长、整句建议使用 人工翻译 。
This company has seamless steel pipe perforation unit production line two, cold draw production line six, hot rolling production line with welded steel pipe production line two.
本公司拥有无缝钢管穿孔机组生产线两条，冷拔生产线六条，热轧生产线一条和焊接钢管生产线两条。
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