Mỹ thử máy bay nhanh gấp sáu lần tốc độ âm thanh
Một người phát ngôn quân đội Mỹ ngày 14/8 cho biết Không quân nước này đã lên kế hoạch tiến hành một cuộc thử nghiệm quan trọng đối với loại máy bay không người lái X-51 WaveRider, mẫu máy bay có thiết kế cho phép bay nhanh gấp sáu lần tốc độ âm thanh (khoảng 5.800 km/h).
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