2012年8月15日 星期三

BBC News - Home: Hypersonic jet fails speed test

BBC News - Home
The latest stories from the Home section of the BBC News web site.
thumbnail Hypersonic jet fails speed test
Aug 15th 2012, 18:50

The US Air Force says its attempt to fly a hypersonic jet at Mach 6 (3,600mph; 5,795 km/h) over the Pacific failed and the aircraft was lost.

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