Home / Standards / GB/T 20968-2007 GB/T 20968-2007 Active Non-destructive testing - Aids to visual inspection - Selection of low-power magnifiers 无损检测 目视检测辅助工具 低倍放大镜的选用 Standard Type GBT ICS 19.100 CCS J04 Status 现行 Issue Date 2007-07-02 Implementation 2007-12-01 Responsible Dept 国家标准委 Drafting Unit 国家标准委