GB/T 21037-2024 Chinese PDF (GB/T21037-2024) GB/T 18282.1-2025 English versions: GB/T 45576-2025

English versions: GB/T 45576-2025

1-2025_Chinese: Testing and calculating methods for seasonal performance factor of energy recovery ventilators for outdoor air handling - Part 1: Seasonal performance factor of sensible heating recovery (Chinese: 热回收新风机组季节性能系数测试和计算方法 第1部分：供热显热回收季节性能系数)

English versions: GB/T 22517

GB/T 14020-2024_Chinese: Hydrogenated rosin (Chinese: 氢化松香)

GB/T 33296-2025_Chinese: Quality requirements and test methods for shale gas products (Chinese: 页岩气产品质量要求和试验方法)

GB/T 21037-2024 Chinese PDF (GB/T21037-2024) GB/T 18282.1-2025 English versions: GB/T 45576-2025GB T 21037 2024_Chinese: Determination of diaveridine, trimethoprim and ormetoprim in feeds (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 21037 2024