Chinese oil firm PetroChina has trumped US rival Exxon Mobil to become the world's biggest firm by market value on its first day of trading in Shanghai.
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March 29 (Bloomberg) -- PetroChina Co. plans to spend at least $60 billion in the next decade on overseas acquisitions, challenging Exxon Mobil Corp. and BP Plc in the race to control oil and gas fields.