
UNPLASTICIZED POLYVINYL CHLORIDE (PVC-U) VALVES - BUTTERFLY VALVES PN 6 AND PN 10, DIMENSIONS
出版:German Institute for Standardisation (Deutsches Institut für Normung)

專家解讀視頻
UNPLASTICIZED POLYVINYL CHLORIDE (PVC-U) VALVES - BUTTERFLY VALVES PN 6 AND PN 10, DIMENSIONS
出版:German Institute for Standardisation (Deutsches Institut für Normung)
專家解讀視頻