Home / Standards / GB/T 20957.7-2007 GB/T 20957.7-2007 Active Test conditions for precision machining centres - Part 7: Accuracy of a finished test piece 精密加工中心检验条件 第7部分：精加工试件精度检验 Standard Type GBT ICS 25.080.20 CCS J54 Status 现行 Issue Date 2007-06-25 Implementation 2007-11-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A