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  • GB/T 20674.2-2020 塑料管材和管件 聚乙烯系統(tǒng)熔接設(shè)備 第2部分:電熔連接 plastics pipes and fittings-Equipment fo...2023-08-10
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  • ETSI TS 138 421-2020 5G; Ng-Ran; Xn Layer 1 (3Gpp Ts 38.421 Version 16.0.0 Release 16)2023-08-10
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  • DL 5190.2-2019 電力建設(shè)施工技術(shù)規(guī)范 第2部分:鍋爐機(jī)組 Technical specification for thermal power erection and c...2023-08-10
  • GB 9706.245-2020 醫(yī)用電氣設(shè)備 第2-45部分:乳腺X射線攝影設(shè)備和乳腺攝影立體定位裝置的基本安全和基本性能專用要求 ...2023-08-10