An exhibitor presents an advanced circuit board, at the three-day-long 4th China International Exposition of Technology for both Military and Civilian Purposes, which is held at the China International Exhibition Center in Beijing, Sept. 2, 2009. Some 357 enterprises from both China and overseas bring their products concerning electronics information shifting from military to civilian application, military application of civilian technology and products, auxiliary items for both usages, etc, to turn up at the exposition. [Xinhua]