Reuters: Yang Hua was a rising star at Chinese oil giant CNOOC Ltd back in 2005. Then, the 44-year-old chief financial officer participated in one of corporate China's biggest belly flops ever. Yang helped CNOOC, the publicly listed arm of state-owned China National Offshore Oil Corp, craft an $18.5 billion bid for Unocal Corp of Los Angeles. It turned into a debacle. Political opposition exploded in Washington, where the company had done little preparation. At home in Beijing, some board members revolted...