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Dot defect is defined as the defective area of the dot area which is larger than 50% of the dot area and it's visible through 5% ND filter.The distance between dot defects should be more than 5mm apart.
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解答:

Dot defect作"坏点"解
坏点的定义是, 该点的缺陷区域超过了总区域的50%, 并且在5%的ND滤光片下可见. 任意两个坏点间的间距必须大于5mm.