供应DDBD型19孔低对比度分辨力模体生产商：中国铝（纯度≥99%），厚度:20mm&plu***n;0.05mm，圆孔直径:1.0cm，孔深的偏差&plu***n;0.02mm。对比度(%)孔深mm对比度(%)孔深mm16.03.22.20.4414.52.91.80.3612.52.51.60.3210.72.141.30.268.81.761.10.227.41.480.950.196.81.360.750.155.31.060.550.114.40.880.350.072.60.52)