Home / Standards / GB/T 20169-2015 GB/T 20169-2015 Active Mixed rare earth oxide of ion-absorpted type rare earth ore 离子型稀土矿混合稀土氧化物 Standard Type GBT ICS 77.120.99 CCS H65 Status 现行 Issue Date 2015-09-11 Implementation 2016-04-01 Responsible Dept 国家标准委 Drafting Unit N/A