People visit a car dirven with electric power at the 12th Beijing International Science and Technology Exposition held in Beijing, on May 20, 2009. The mini car, which is designed by Hong Kong Polytechnic University, is able to run some one hundred kilometers once charged. [Xinhua]

People visit steel tubes of special type made by Beijing Capital Steel Company at the 12th Beijing International Science and Technology Exposition held in Beijing, on May 20, 2009. [Xinhua]