GB/T 451.2-2023 Chinese PDF (GB/T451.2-2023) GB/T 27534.2-2025 GB/T 45140-2025_Chinese: Technical guideline for

GB/T 45140-2025_Chinese: Technical guideline for monitoring and effectiveness evaluation of mangrove ecological restoration (Chinese: 红树林生态修复监测和效果评估技术指南)

2-2025_Chinese: Overhead contact charging system for electric buses - Part 2: Charging connection set (Chinese: 电动客车顶部接触式充电系统 第2部分：充电连接装置)

English versions: GB/T 45496-2025

GB/T 14420-2024_Chinese: Analysis of water used in boiler and cooling system - Determination of chemical oxygen demand - Rapid method with potassium dichromate (Chinese: 锅炉用水和冷却水分析方法 化学耗氧量的测定 重铬酸钾快速法)

beverage and refined tea enterprise (Chinese: 温室气体排放核算与报告要求 第25部分：食品、烟草及酒、饮料和精制茶企业)

GB/T 451.2-2023 Chinese PDF (GB/T451.2-2023) GB/T 27534.2-2025 GB/T 45140-2025_Chinese: Technical guideline forGB T 451. 2 2023_Chinese: Paper and board Part 2: Determination of grammage (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 451. 2 2023