BEIJING (AFX-ASIA) – China National Offshore Oil Corp (CNOOC), the parent company of CNOOC Ltd (HK 0883; NYSE CEO), has invested 300 million yuan in a bitumen plant with annual output of 300,000 tons in Luzhou in the southwestern Chinese province of Sichuan, the company said on its website. (US$1=8.27 yuan). The company said a…