Home / Standards / GB/T 4930-2021 GB/T 4930-2021 Active Microbeam analysis—Electron probe microanalysis—Guidelines for the specification of certified reference materials (CRMs) 微束分析 电子探针显微分析 标准样品技术条件导则 Standard Type GBT ICS 19.020 CCS G04 Status 现行 Issue Date 2021-05-21 Implementation 2021-12-01 Responsible Dept 国家标准委 Drafting Unit N/A