Home / Standards / GB/T 20724-2006 GB/T 20724-2006 Abolished Method of thickness measurement for thin crystal by convergent beam electron diffraction 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 废止 Issue Date 2006-12-25 Implementation 2007-08-01 Responsible Dept 国家标准委 Drafting Unit 国家标准委