Photography - transmission and reflection densitometers - method for determining performance 摄影技术.透射和反射光密度计.性能测定方法
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Graphic technology - process control - optical , geometrical and metrological requirements for reflection densitometers for graphic arts use 图形技术.过程控制.图形艺术用反射密度计的光学几何图形和计量要求