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GBT 29046-2012 Testing method for technical indicators of prefabricated directly buried thermal insulation pipelines for urban heating
GBT 29047-2021 High-density polyethylene outer protective pipe rigid polyurethane foam plastic prefabricated direct-buried thermal insulation pipe and pipe fittings
Polyurethane insulation construction technology - cold storage
Cold storage design standards
0417-3284411