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GB/T 15558.1-2023 Chinese PDF (GB/T15558.1-2023) GB/T 45547-2025 English versions: GB 30720-2025GB T 15558. 1 2023_Chinese: Buried polyethylene(PE) piping systems for the supply of gaseous fuels Part 1: General (Chinese: PE 1) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 15558. 1 2023
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