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Boeing predicted last year that China will become the world's top aviation market within 20 years, projecting a demand for 6,810 new aircraft in the next two decades with a total value of trillion.

Blued announced on Sunday that it would close new registrations for a week, and intensify supervisory measures, including relying on technology and manpower to cancel accounts held by minors.

Boeing shares rose 1.5 percent.

Boeing named Jim McNerney CEO in 2005, but kept in touch with Calhoun, who then worked for a General Electric division with annual sales of billion that included the manufacture of aircraft engines. Calhoun left GE a year later to head Nielsen, a media and data company.

Binoculars, a shovel and water tank are the necessary tools when rangers patrol on the mountain. But now each of them is equipped with a hand-held terminal that can report fires, capture photos of rare wild animals or call for help.