
Aggregates for cmortar and concrete - Part 1: Normal-weight and heavy aggregates
出版:German Institute for Standardisation (Deutsches Institut für Normung)

專家解讀視頻
Aggregates for cmortar and concrete - Part 1: Normal-weight and heavy aggregates
出版:German Institute for Standardisation (Deutsches Institut für Normung)
專家解讀視頻