ASTM D6341-2021 实施日期:2021-01-15 英文名:Standard Test Method for Determination of the Linear Coefficient of Thermal Expansion of Plastic Lumber and Plastic Lumber Shapes Bet
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