Home / Standards / GB/T 2831-2009 GB/T 2831-2009 Active Surface form deviation of optical elements 光学零件的面形偏差 Standard Type GBT ICS 37.020 CCS N30 Status 现行 Issue Date 2009-11-15 Implementation 2010-02-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A