1CONEXPO 2011展出的工程起重机自2008年以后,北美工程起重机销量严重萎缩,2010年美国市场全地面起重机仅销售了约100台,处于15年来的最低水平。由于看好未来市场前景,全球主要工程起重机制造商全部亮相CONEXPO2011,参展的部分起重机型号见表1。由于发动机排 Construction Crane at 1CONEXPO 2011 Since 2008, sales of construction cranes in North America have shrunk dramatically. In 2010, all-terrain cranes in the U.S. market were only sold at about 100 units, the lowest level in 15 years. As optimistic about the future market prospects, the world’s major construction crane manufacturers debut CONEXPO2011, exhibitors part of the crane model shown in Table 1. Due to the engine row