GB/T 20878-2024 Chinese PDF (GB/T20878-2024) GB/T 13537-2024 English versions: GB/T 45656-2025

English versions: GB/T 45656-2025

English versions: GB/T 13465

English versions: GB/T 17591-2025

7-2024_Chinese: Electrical safety in low voltage distribution systems up to 1000V a

7-2024_Chinese: Semiconductor devices - Part 5-7: Optoelectronic devices - Photodiodes and phototransistors (Chinese: 半导体器件 第5-7部分：光电子器件 光电二极管和光电晶体管)

GB/T 20878-2024 Chinese PDF (GB/T20878-2024) GB/T 13537-2024 English versions: GB/T 45656-2025GB T 20878 2024_Chinese: Stainless steels Designation and chemical composition (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 20878 2024