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Computer multi-media ----------is a kind of computer picture language technology which takes stripes of a certain length and different broadness combined with number and can be read through light and electric 扫描 device . The distinguishable character of stripes depends on distingwishabk ability of light and electric 扫描 device and printing quality of stripe labels .It has a high fake-proof ability because it must go through register by international or national encoding center and at the same time , it has high demand on size loads , printing –oil ,. pressure and thickness of level of oil .
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