Home / Standards / GB/T 1550-1997 GB/T 1550-1997 Abolished Standard methods for measuring conductivity type of extrinsic semiconducting materials 非本征半导体材料导电类型测试方法 Standard Type GBT ICS 77.040.01 CCS H21 Status 废止 Issue Date 1997-06-03 Implementation 1997-12-01 Responsible Dept 国家标准委 Drafting Unit N/A