Home / Standards / GBT 37121-2018 GBT 37121-2018 Non-destructive testing—Crack test card for industrial computed tomography (CT) testing 无损检测 工业计算机层析成像检测用裂纹测试卡 Standard Type GBT ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A