(161224) -- QINGDAO, Dec. 24, 2016 (Xinhua) -- A candidate receives a metal detector check before participating in the 2017 national entrance examinations for postgraduate studies at China University of Petroleum in Qingdao, east China's Shandong Province, Dec. 24, 2016. The entrance examinations began on Saturday. (Xinhua/Liu Jishun)
