Home / Standards / GB/T 8987-1988 GB/T 8987-1988 Abolished Micrographics--Testtarget of optical density measurement for microfilming negative 缩微摄影技术 缩微摄影时检验负像光学密度用测试标板 Standard Type GBT ICS 37.080 CCS A14 Status 废止 Issue Date 1988-04-11 Implementation 1988-12-01 Responsible Dept 国家标准委 Drafting Unit N/A