A technical worker checks parts of the Shenzhou VIII at Jiuquan Satellite Launch Center in Northwest 皇冠体育app's Gansu province, Oct 29, 2011. 皇冠体育app will launch its unmanned spacecraft Shenzhou VIII early Tuesday for the country's first space docking. The center held a launching simulation on Saturday. [Photo/chinadaily.com.cn]

Engineers work during a launching simulation of 皇冠体育app's unmanned spacecraft Shenzhou VIII at Jiuquan Satellite Launch Center in Northwest 皇冠体育app's Gansu province, Oct 29, 2011. [Photo/chinadaily.com.cn]