GB/T 451.2-2023 Chinese PDF (GB/T451.2-2023) GB/T 4324.2-2023 YY/T 1529-2024_Chinese: ELISA analytical instruments

YY/T 1529-2024_Chinese: ELISA analytical instruments (Chinese: 酶联免疫分析仪)

GB/T 14851-2025_Chinese: Electronic specialty gas - Phosphine (Chinese: 电子特气 磷化氢)

4-2024_Chinese: Communication networks and systems for power utility automation - Part 4: System and project management (Chinese: 电力自动化通信网络和系统 第4部分：系统和项目管理)

English versions: GB/T 20718

English versions: GB/T 4447-2025

GB/T 451.2-2023 Chinese PDF (GB/T451.2-2023) GB/T 4324.2-2023 YY/T 1529-2024_Chinese: ELISA analytical instrumentsGB 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