Home / Standards / GB/T 34210-2017 GB/T 34210-2017 Active Test method for determining the orientation of sapphire single crystal 蓝宝石单晶晶向测定方法 Standard Type GBT ICS 77.040 CCS H21 Status 现行 Issue Date 2017-09-07 Implementation 2018-06-01 Responsible Dept 国家标准委 Drafting Unit N/A