Home / Standards / GB/T 8990-1988 GB/T 8990-1988 Abolished Micrographics--Reflectance test target used in the test target for inspecting the quality of micrography of technical drawing 缩微摄影技术 用于“检验技术图纸缩微摄影质量测试标板”的反射率灰板 Standard Type GBT ICS 37.080 CCS A14 Status 废止 Issue Date 1988-04-12 Implementation 1988-12-01 Responsible Dept 国家标准委 Drafting Unit N/A