PTR [PETROCHINA CO] 6-K: PETROCHINA COMPANY LIMITED (a joint stock limited company
[PETROCHINA COMPANY LIMITED (a joint stock limited company incorporated in the Peoples Republic of China with limited liability) (Stock Code: 857) ANNOUNCEMENT REGARDING THE APPROVAL OF THE PROPOSED ISSUANCE OF EXCHANGEABLE CORPORATE BONDS BY THE CONTROLLING SHAREHOLDER Company CNPC Proposed Exchang]