Yao Wei (C), general manager of the Pipeline Branch of Petro China Co Ltd (PBPC), pushes a button to make the pipeline begin operating at a plant in Mohe County, northeast China's Heilongjiang Province, Jan 1, 2011. [Xinhua]

A worker from Mohe's entry-exit inspection and quarantine bureau samples a bottle of oil to monitor its quality at a plant in Mohe County, northeast China's Heilongjiang Province, Jan 1, 2011. [Xinhua]