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GB/T 31562-2024 Chinese PDF (GB/T31562-2024) GB/T 18876.2-2024 GB/T 20656-2023_Chinese: Petroleum and natural

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GB/T 20656-2023_Chinese: Petroleum and natural gas industries - Field inspection of new casing

English versions: GB/T 14207-2024

English versions: GB/T 45464-2025

English versions: GB/T 18936-2025

English versions: GB/T 30844

GB/T 31562-2024 Chinese PDF (GB/T31562-2024) GB/T 18876.2-2024 GB/T 20656-2023_Chinese: Petroleum and naturalGB T 31562 2024_Chinese: Foundry machinery Determination method of cleanliness (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 31562 2024

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