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China Shenhua Energy Co said in a filing on Sunday to the Hong Kong Stock Exchange that it was informed by parent company－China's largest coal miner Shenhua Group Corporation－of "significant matter containing substantial uncertainty which is subject to the approval of the relevant authorities".

China National Petroleum Corp (CNPC), the country's largest oil and gas company, on Thursday signed agreements with Russia's top independent gas producer, Novatek, to buy a 10 percent stake in its new liquefied natural gas project, Arctic LNG 2.

China United Network Communications Group, the country's second-largest telecom carrier has also accelerated its efforts to develop 5G technology. It recently established the country's first pre-5G base station in Jilin province in partnership with Huawei Technologies Co.

China and Cambodia have maintained close cooperation on global and regional issues, understood and supported each other on issues concerning their core interests and major concerns, and jointly preserved regional peace, stability and development, he added.

China Petroleum and Chemical Corp is one of China's largest producers of hydrogen, producing over 3 million metric tons last year, mostly made from fossil fuels or produced as a by-product of its refining and chemical operations. For example, Sinopec's Shanghai hydrogen refueling stations are supplied by purified by-product hydrogen from the Gaoqiao petrochemical facility based in the city.