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COMAC has been steadily delivering its regional ARJ21 to customers throughout the pandemic and its narrowbody C919, which is still in flight testing phase, is expected to obtain an airworthiness certificate from China's aviation regulator next year.

Cameron said UK-China cooperation has been deepened with two-way investment and trade on a continuous rise. The UK will continue to firmly support the rules-based multilateralism and free trade, he said.

CNPC, the country's largest oil and gas producer by annual output, and supplier of more than 70 percent of the natural gas used in China, said it would provide 70 billion cu m of natural gas this year to alleviate gas shortages during the heating season.

CIC posted a US dollar-denominated net return of 6.22 percent in overseas investment last year, compared with a loss of 2.96 percent in 2015.

Cambodian Environment Minister Say Samal said the MoUs would provide a greater opportunity to Cambodia to protect its environment and ecology.