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COMAC is the Commercial Aircraft Corporation of China Ltd, which built the C919, and Safran SA is a leading aerospace engine and equipment manufacturer.

Cai Yige, manager of Tencent's blockchain business, said the blockchain-based invoices are difficult to be tampered with, which can help tax supervisors trace their sources and determine their authenticity.

California, partly because it is home to the Silicon Valley, has been more open to new technologies and is thus a popular destination for testing of autonomous vehicles. China has banned testing autonomous cars on public roads since late 2016.

CNPC produced 103.3 billion cu m of natural gas in 2017, a year-on-year increase of 5.3 percent. It has also vowed to continue negotiating with gas-rich countries for more cost-efficient imports.

CHICAGO -- US researchers have identified a previously unknown route for cellular fuel delivery. The finding could shed light on the process of aging and the chronic diseases that often accompany it.