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Rescue workers stand by the mine entrance as smoke billows out after a gas explosion at a coal mine in Hegang City, in northeast China's Heilongjiang Province, November 21, 2009.[Xinhua]

 
Rescue workers stand by the mine entrance as smoke billows out after a gas explosion at a coal mine in Hegang City, in northeast China's Heilongjiang Province, November 21, 2009.[Xinhua]