Dan Zenghai: Probe Into The Development Of Key Technologies Of Construction Cranes

On March 31, 2016, "2016 Project mechanical product development (Beijing) Forum and the China engineering machinery annual products TOP50 ceremony" was held in Beijing. China construction machinery industry association and its subsidiary branches, national engineering machinery quality supervision and inspection center, relevant trade associations and construction machinery manufacturers, construction companies, research institutions, universities, the news media more than more than 200 guests attended the annual event.