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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 44499-2024
GB/T 44797-2025_Chinese: Microwave hybrid integrated circuits - Synthesized frequency sources (Chinese: 微波混合集成电路 合成频率源)
English versions: GB/T 40711
English versions: GB/T 1796
GB/T 29165.3-2023 Chinese PDF (GB/T29165.3-2023) GB/T 21046-2024 1-2025_Chinese: Testing and calculating methodsGB T 29165. 3 2023_Chinese: Petroleum and natural gas industries Glass reinforced plastics (GRP) piping Part 3: System design (Chinese: 3) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 29165. 3 2023
US$ 310.00
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