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CNPC is China's largest oil and gas producer and supplier, as well as one of the world's major oilfield service providers.

Despite government efforts to fight pollution, outbreaks of smog have become increasingly common in winter in northern China where cold weather conditions and the burning of coal for heating combine to exacerbate the situation.

In the instruction read at a meeting held on Sunday, Xi noted that the campaign launched last year had achieved remarkable results.

She said the joint statement inked last December on the normalization of bilateral ties served as an important guarantee for restoring and developing China-Norway ties. Norway will adhere to the statement, uphold the one-China policy, and highly value China's core interests and major concerns.

He called for more efficient government services and advanced technology support to foster an attractive system to encourage innovation.