GB/T 45581-2025 Chinese PDF (GB /T45581-2025) GB/T 41780.3-2025 4-2025_Chinese: Acoustics - Laboratory measurement

4-2025_Chinese: Acoustics - Laboratory measurement of sound insulation of building elements - Part 4: Measurement procedures and requirements (Chinese: 声学 建筑构件隔声的实验室测量 第4部分：测量程序和要求)

English versions: GB/T 22068-2025

GB/T 45457

2-2025_Chinese: Test methods of rare earth phosphors for LED - Part 2: Determination of relative brightness (Chinese: LED用稀土荧光粉试验方法 第2部分：相对亮度的测定)

GB/T 45629

GB/T 45581-2025 Chinese PDF (GB /T45581-2025) GB/T 41780.3-2025 4-2025_Chinese: Acoustics - Laboratory measurementGB T 45581 2025_Chinese: Guidelines for service of integrated community facilities (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 45581 2025