
Trapezoidal sheeting in building; trapezoidal steel sheeting; general requirements and determination of loadbearing capacity by calculation
出版:German Institute for Standardisation (Deutsches Institut für Normung)

專家解讀視頻
Trapezoidal sheeting in building; trapezoidal steel sheeting; general requirements and determination of loadbearing capacity by calculation
出版:German Institute for Standardisation (Deutsches Institut für Normung)
專家解讀視頻