
Aggregates for mortar and concretemortar Part 2: Lightweight aggregates
出版:German Institute for Standardisation (Deutsches Institut für Normung)

專家解讀視頻
Aggregates for mortar and concretemortar Part 2: Lightweight aggregates
出版:German Institute for Standardisation (Deutsches Institut für Normung)
專家解讀視頻