What are the wholly-owned subsidiaries of PetroChina?

China Petroleum Pipeline Co., Ltd., China Petroleum Daqing Oilfield Co., Ltd., China Petroleum International Investment Co., Ltd., China Petroleum Hongkong Co., Ltd., China Petroleum Exploration and Development Co., Ltd. and China Petroleum International Co., Ltd. have six wholly-owned subsidiaries. They are China Petroleum Pipeline Co., Ltd., China Petroleum Daqing Oilfield Co., Ltd., China Petroleum International Investment Co., Ltd., China Petroleum Hong Kong Co., Ltd., China Petroleum Exploration and Development Co., Ltd. and China Petroleum Kunlun Hotel Co., Ltd., a wholly-owned subsidiary of China Petroleum International Co., Ltd., which are mainly responsible for top-level design, standard specification formulation and brand guidance for the specialized operation of provincial sales companies' non-oil business, and undertake unified procurement and distribution of goods, logistics optimization, joint venture cooperation and self-owned commodity development, and their income is included in the operating income of