GB/T 45131-2025 Chinese PDF (GB /T45131-2025) GB/T 45030-2024 English versions: GB/T 29479

English versions: GB/T 29479

GB/T 44913-2024_Chinese: Filled monocrystal gemstones - Identification and classification (Chinese: 充填处理单晶体宝石 鉴定与分类)

2-2025_Chinese: Petroleum and natural gas industries - Materials for use in H2S-containing environments in oil and gas production - Part 2: Cracking-resistant carbon and low alloy steels

16 MPa series - Part 2: Compact series with bores from 25 mm to 220 mm (Chinese: 液压传动 16MPa系列单出杆缸的安装尺寸 第2部分：缸径25mm～220mm 紧凑型系列)

GB/T 45131-2025 Chinese PDF (GB /T45131-2025) GB/T 45030-2024 English versions: GB/T 29479GB T 45131 2025_Chinese: Analysis of water used in boiler and cooling system Determination of phosphate, chloride, silicate, total alkalinity, phenolphthalein alkalinity, hardness and iron Spectrophotometric detection by discrete analysis systems (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 45131 2025