GB/T 15241.1-2023 Chinese PDF (GB/T15241.1-2023) GB/T 45284.5-2025 English versions: GB/T 45000-2024

English versions: GB/T 45000-2024

English versions: GB/T 25246-2025

English versions: GB/T 45505

2-2024_Chinese: Cardiovascular implants - Cardiac valve prostheses - Part 2: Surgically implanted heart valve substitutes (Chinese: 心血管植入器械 人工心脏瓣膜 第2部分：外科植入式人工心脏瓣膜)

GB/T 22453-2025_Chinese: Non-linear optical crystal devices measuring method for laser (Chinese: 激光用非线性光学晶体元件性能测量方法)

GB/T 15241.1-2023 Chinese PDF (GB/T15241.1-2023) GB/T 45284.5-2025 English versions: GB/T 45000-2024GB T 15241. 1 2023_Chinese: Ergonomic principles related to mental workload Part 1: General terms and methods for measuring and assessing mental workload (Chinese: 1) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 15241. 1 2023