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China Petroleum's production and operation remained stable in the first half of 2020
China Petroleum's production and operation remained stable in the first half of 2020China Petroleum's production and operation remained stable in the first half of 2020China Petroleum's production and operation remained stable in the first half of 2020China Petroleum's production and operation remained stable in the first half of 2020China Petroleum's production and operation remained stable in the first half of 2020China Petroleum's production and operation remained stable in the first half of 2020