A Chinese official sticks signs of "China Aid" on bags of emergency aid materials at Zhengding International Airport in Shijiazhuang, capital of north China's Hebei Province, January 31, 2010. Three military transport planes carrying some emergency aid materials flew to Mongolia on Sunday. The emergency aid materials provided by the Chinese government include portable generators, quilts as well as rice. Mongolia is currently experiencing an extreme cold weather and heavy snow. [Xinhua]