PRECAST CONCRETE PRODUCTS - BEAM-AND-BLOCK FLOOR SYSTEMS - PART 1: BEAMS
出版:Comite Europeen de Normalisation
专家解读视频
PRECAST CONCRETE PRODUCTS - BEAM-AND-BLOCK FLOOR SYSTEMS - PART 1: BEAMS
出版:Comite Europeen de Normalisation
专家解读视频