ISO 17420-4-2021 实施日期:2021-01-11 Respiratory protective devices — Performance requirements — Part 4: Requirements for supplied breathable gas RPD
ETSI TS 129 333/2-2021 实施日期:2021-01-06 Digital Cellular Telecommunications System (Phase 2+) (Gsm); Universal Mobile Telecommunications System (Umts); Multimedia R
GB/T 29055-2019 实施日期:2020-05-01 现 行 中文名:太阳能电池用多晶硅片 英文名:Multicrystalline silicon wafers for photovoltaic solar cell
GB/T 29054-2019 实施日期:2020-05-01 现 行
PD CEN/TS 16702-2-2020 实施日期:2020-04-08 现 行 英文名:Electronic fee collection. Secure monitoring for autonomous toll systems. Trusted recorder
PD ISO/TS 19082-2020