Home / Standards / GB/T 20228-2021 GB/T 20228-2021 Active Gallium arsenide single crystal 砷化镓单晶 Standard Type GBT ICS 29.045 CCS H83 Status 现行 Issue Date 2021-05-21 Implementation 2021-12-01 Responsible Dept 国家标准委 Drafting Unit N/A