Home / Standards / GB/T 39131-2020 GB/T 39131-2020 Active Terms and definitions of synthetic crystal materials 人工晶体材料术语 Standard Type GBT ICS 01.040.01 CCS Q65 Status 现行 Issue Date 2020-10-11 Implementation 2021-09-01 Responsible Dept 中国建筑材料联合会 Drafting Unit N/A