GB 20052-2024 Chinese PDF GB/T 45471-2025 English versions: GB/T 45134-2025

English versions: GB/T 45134-2025

English versions: GB/T 45276-2025

2-2025_Chinese: Petroleum and natural gas industries - Materials for use in H2S-containing environments in oil and gas production - Part 2: Cracking-resistant carbon and low alloy steels

GB/T 27069-2025_Chinese: Guidelines for the mutual recognition evaluation of product conformity assessment results (Chinese: 产品合格评定结果相互承认评价指南)

headed (Chinese: 成型模 带头导套和带头定位导套)

GB 20052-2024 Chinese PDF GB/T 45471-2025 English versions: GB/T 45134-2025GB 20052 2024_Chinese: Minimum allowable values of energy efficiency and the energy efficiency grades for power transformers (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB 20052 2024