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During a White House news briefing on Wednesday, US Homeland Security Secretary Kirstjen Nielsen said the National Guard would support US Custom and Border Protection, but would not be involved in enforcement.
During a tour of a Ford manufacturing plant in the state of Michigan on Thursday, Trump said the US would not close in the event of a second wave of the virus.
Due to factors in the Tibetan plateau's climate, such as low oxygen, the Tibet autonomous region has one of the highest rates of congenital heart disease in China.
Dubbed "the natural geological museum", the mining site in Koktokay township in the county of Fuyun has more than 80 kinds of minerals, nearly half of the 170-plus types known in China. The mining site also has one of the largest pits in the world, which is more than 200 meters deep.
Duke University mechanical engineering professor Missy Cummings said the recent Uber and Tesla crashes show the "technology they are using is immature."
来源：资阳报