MOSCOW, Dec. 30 (Xinhua) -- Russia's upgraded light multi-purpose helicopter Mi-34M1 has successfully completed its first test flight, the Russian Ministry of Industry and Trade said on Tuesday.

WUHAN, Dec. 26 (Xinhua) -- Central China's Hubei East Lake Laboratory on Friday announced a groundbreaking achievement in high-speed maglev technology, with its test line accelerating a 1.1-tonne ...