What is the present status of large Boom Tower Crane?
Large boom crane arm depicts one and another new history. New York's World Trade Center towers is the skyscraper that is the highest and has the most floor in New York City .Its main building is steel and concrete composite structures,using steel 78 thousand tons.The Building started in 1966 and lasted seven years, with 110 layers, 411 meter in height as a giant skyscraper it is writed in history. During in Construction
