رتبة الخرسانة مقاومة الضغط لخرسانة... الهندسة ...
Oct 22, 2017· The # Dom_Luís # bridge # Porto # Portugal The Dom Luís I Bridge (Portug... uese: Ponte de Dom Luís I), or Luís I Bridge, is a doubledeck metal arch bridge that spans the River Douro between the cities of Porto and Vila Nova de Gaia in Portugal. At its construction, its 172 metres (564 ft) span was the longest of its type in the world. It has been confused with the nearby Maria Pia Bridge ...