reflection density meaning in English

反射疗法
反射密度

Geometric conditions for photographic reflection density measurement
摄影反射密度测量的几何条件
Photography - density measurements - geometric conditions for reflection density
摄影技术.密度测量.反射密度用几何学条件
Photographic sensitometry , determination of optical density ; geometric conditions for reflection density
照相感光度测量技术.光密度的测定.反射密度的几何条