Home / Standards / GB/T 39231-2020 GB/T 39231-2020 Active Cerium chloride anhydrate 无水氯化铈 Standard Type GBT ICS 77.120.99 CCS H65 Status 现行 Issue Date 2020-11-19 Implementation 2021-10-01 Responsible Dept 国家标准委 Drafting Unit N/A