Which country has revoked the Visas of more than 1,000 Chinese students recently?

China now has the world most powerful hypersonic wind tunnel. the ‘world-leading’ JF-22 can simulate extreme flight conditions at Mach 30. Facility will play key role in developing Beijing’s hypersonic weapons programme and passenger air travel. After five years of construction, the most powerful wind tunnel on the planet has roar to life in China’s capital, Located in the mountainous Huairou district of northern Beijing, the JF-22 wind tunnel is 4 metres (13 feet) in diameter and can generate air flow speeds up to 10km (6.2 miles) per second, according to a final evaluation conducted on May 30.That makes it the largest and fastest wind tunnel in the world, capable of simulating hypersonic flight conditions up to Mach 30, according to the Institute of Mechanics, the owner of the facility.