ICS 73.040 CCS D 21 GB 中华人民共和国国家标准 GB/T 19494.1—2023 代替GB/T19494.1—2004 煤炭机械化采样 第1部分:采样方法 Mechanical sampling of coal-Part 1: Method for sampling (ISO 13909-1: 2016, Hard coal and coke—Mechanical sampling Part 1:General introduction; ISO 13909-2: 2016, Hard coal and coke- Mechanical samplingPart 2: CoalSampling from moving streams; IS0 13909-3: 2016, Hard coal and coke—Mechanical sampling— Part3:CoalSampling from stationarylots,NEQ 2023-11-27发布 2024-03-01实施 国家市场监督管理总局 发布 国家标准化管理委员会