Registered Public Utility Engineer — Power
Registered Public Utility Engineer — Power (注册公用设备工程师(动力), China)
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According to CJJ/T 34-2022 and GB/T 29047, what are the three integral layers comprising a standard factory-prefabricated direct-buried pre-insulated bonded polyurethane hot water heating pipe (直埋预制保温管)?
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