Home / Standards / GB/T 11500-1989 GB/T 11500-1989 Active Geometric conditions for measuring transmission density 摄影透射密度测量的几何条件 Standard Type GBT ICS 37.040 CCS G81 Status 现行 Issue Date 1989-06-28 Implementation 1990-06-01 Responsible Dept 中国石油和化学工业联合会 Drafting Unit N/A