
Construction contract procedures (VOB) Part C: General technical specifications in contruction contracts (ATV); Underground drainage
出版:German Institute for Standardisation (Deutsches Institut für Normung)

專家解讀視頻
Construction contract procedures (VOB) Part C: General technical specifications in contruction contracts (ATV); Underground drainage
出版:German Institute for Standardisation (Deutsches Institut für Normung)
專家解讀視頻