Home / Standards / GB/T 46430-2025 GB/T 46430-2025 Active Photography一Transmission and reflection densitometers—Method for determining performance 摄影 透射和反射光密度计 性能测定方法 Standard Type GBT ICS 37.040.20 CCS G80 Status 现行 Issue Date 2025-10-31 Implementation 2026-05-01 Responsible Dept 中国石油和化学工业联合会 Drafting Unit N/A