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Current Secretary-General Antonio Guterres paid tribute to his predecessor at the ceremony and wrote on a condolence book in memory of Annan.

Currently, there are 2,100 members of the National Guard helping at the border.

Crew Dragon completed its unmanned test flight last March while Boeing's Starliner went out of its planned orbit after separation with the rocket last December, resulting in a cut-short unmanned mission.

Critics argue FCVs may never amount to more than a niche technology. But proponents counter hydrogen is the cleanest energy source for autos available and that with time and more refueling infrastructure, it will gain acceptance.

Currently, China's big three telecom carriers, China Mobile, China Unicom and China Telecom, are working on large-scale 5G trials and application tests in up to 17 cities, including Beijing, Shanghai, Guangzhou in Guangdong province, and Hangzhou in Zhejiang province. The new 5G systems are expected to be 10 times faster than 4G and will support superfast movie downloads, self-driving cars and the streaming of virtual reality games.