Chinese stocks closed lower Friday, dragged down by coal and oil-related shares. The benchmark Shanghai Composite Index closed at 2,642.31, down 45.67 points, or 1.70 percent, while the Shenzhen Component Index dipped 230.71 points, or 2.04 percent, to end at 11,090.46. Combined turnover dropped to 239.36 billion yuan (35.36 billion U.S. dollars) from 251.78 billion yuan on the previous trading day. 