Home / Standards / GB/T 38783-2020 GB/T 38783-2020 Active Method of coating thickness determination for precious metal composites by scanning electron microscope 贵金属复合材料覆层厚度的扫描电镜测定方法 Standard Type GBT ICS 77.120.99 CCS H15 Status 现行 Issue Date 2020-06-02 Implementation 2021-05-01 Responsible Dept 中国有色金属工业协会 Drafting Unit N/A