GB/T 30491.2-2024 Chinese PDF (GB/T30491.2-2024) GB/T 16439-2024 English versions: GB/T 16659-2024

English versions: GB/T 16659-2024

English versions: GB 44172-2024

English versions: GB/T 26871-2024

English versions: GB/T 18760-2025

GB/T 45250-2025_Chinese: Telecom and internet services - Standardization guideline (Chinese: 电信和互联网服务 标准化工作指南)

GB/T 30491.2-2024 Chinese PDF (GB/T30491.2-2024) GB/T 16439-2024 English versions: GB/T 16659-2024GB T 30491. 2 2024_Chinese: Natural gas Calculation of thermodynamic properties Part 2: Single phase properties(gas, liquid, and dense fluid)for extended ranges of application (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 30491. 2 2024