Home / Standards / GB/T 20724 GB/T 20724 Active Microbeam analysis—Method of thickness measurement for thin crystals by convergent beam electron diffraction 微束分析 薄晶体厚度的会聚束电子衍射测定方法 Standard Type GBT ICS 71.040.99 CCS N53 Status 现行 Issue Date 2021-12-31 Implementation 2022-07-01 Responsible Dept 国家标准委 Drafting Unit 国家标准委