Dtu 22 - 1 . building works . exterior cladding using large prefabricated panels of the solid or ribbed slab type or ordinary concrete . part 1 : technical specifications - part 2 : special clauses Dtu 22 - 1 .建筑工程.用大型实心或密肋板或普通水泥的预制板做成的外部覆面板.第1部分:技术规范.第2部分:特殊规定