ASTM E2649-20 使用火花发射光谱测定密封绝缘玻璃单元中的氩浓度的标准测试方法.pdf文档页数:8文档大小:2.9MB文档格式:pdf This international standard was developed in accordance with internationally recognized principles on standardization established in the
DB11/T 2045-2022 城市轨道交通牵引能耗限额及计算方法.pdf文档页数:8文档大小:120.86KB文档格式:pdf cs03.220.20 CCS R 80DB11北京市地方标准 DB11/20452022 城市轨道交通牵引能耗限额及计算方法 The quota and calculation method of traction energy consumption in ur