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China welcomes the planned visit of United States Secretary of Defense James Mattis in the first half of 2018, a Defense Ministry spokesman said on Thursday.

China published a guideline on Thursday on improving the market-based allocation of production factors in a bid to further facilitate their free and orderly flow and stimulate market vitality.

China significantly ramped up imports of liquefied natural gas in the first half of the year, as part of broader efforts to clean up its coal-dominated energy mix.

China was the only G20 economy to record economic growth in the second quarter of this year while most other G20 member countries saw an "unprecedented "contraction in their economies, the Organization for Economic Cooperation and Development said in a report on Monday.

China pledged to deepen SOE reform in this year's annual government work report as a method to improve efficiency. Apart from measures like cutting capacity, managing "zombie companies," excising layers of hierarchy and calling for innovation among firms, China also introduced a mixed-ownership system.