DTU 40-23. BUILDING WORKS. PRIVATE CONTRACTS. ROOF COVERING MADE OF CLAY PLAIN ROOFING TILES. PART 2: SPECIAL CLAUSES.是什么意思_DTU 40-23. BUILDING WORKS. PRIVATE CONTRACTS. ROOF COVERING MADE OF CLAY PLAIN ROOFING TILES. PART 2: SPECIAL CLAUSES.在线翻译_英语_读音_用法_例句