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
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
CNAS TRL014-2021 实施日期:2021-01-01 科研数据特征划分及其分类体系表
GY/T 344-2021 实施日期:2021-01-20 互联网电视内容服务平台技术要求
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