GB/T 27917.2-2023 Chinese PDF (GB/T27917.2-2023) GB/T 22517.3-2024 GB/T 45020-2024_Chinese: Methods for chemical

GB/T 45020-2024_Chinese: Methods for chemical analysis of niobium hafnium alloys - Determination of trace impurity elements content - Inductively coupled plasma mass spectrometry (Chinese: 铌铪合金化学分析方法 痕量杂质元素的测定 电感耦合等离子体质谱法)

GB/T 16751

English versions: GB/T 17241

English versions: GB/T 27532-2024

4-2025_Chinese: Acoustics - Laboratory measurement of sound insulation of building elements - Part 4: Measurement procedures and requirements (Chinese: 声学 建筑构件隔声的实验室测量 第4部分：测量程序和要求)

GB/T 27917.2-2023 Chinese PDF (GB/T27917.2-2023) GB/T 22517.3-2024 GB/T 45020-2024_Chinese: Methods for chemicalGB T 27917. 2 2023_Chinese: Express service Part 2: Organization requirements (Chinese: 2) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 27917. 2 2023