Students stand on the balconies of their dormitories at Heilongjiang University in Harbin, capital of northeast China's Heilongjiang Province, Sept. 16, 2009. Heilongjiang University scheduled to suspend class from 8:00 a.m. on Sept. 16 to Sept. 19 due to the A/H1N1 flu collective outbreak which was confirmed on Sept. 13.[Xinhua]