GB/T 12538-2023 Chinese PDF (GB/T12538-2023) GB/T 19980-2025 GB/T 45615-2025_Chinese: Systems and software

GB/T 45615-2025_Chinese: Systems and software engineering - Methods and tools for model-based systems and software engineering (Chinese: 系统与软件工程 基于模型的系统与软件工程方法和工具)

GB/T 45602-2025_Chinese: Ships and marine technology - Adjustable roller-type chain stoppers (Chinese: 船舶与海洋技术 可调式滚轮闸刀掣链器)

GB/T 45561

English versions: GB/T 45425-2025

1-2024_Chinese: Mechanical vibration - Measurement and evaluation of machine vibration - Part 1: General guidelines (Chinese: 机械振动 机器振动的测量和评价 第1部分：总则)

GB/T 12538-2023 Chinese PDF (GB/T12538-2023) GB/T 19980-2025 GB/T 45615-2025_Chinese: Systems and softwareGB T 12538 2023_Chinese: Road vehicles Determination of centre of gravity (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 12538 2023