【简答题】TOUR THE BLUE MOUNTAINS IN COMFORT WITH OZ TRAILS Known as “The Grand Canyon” of Austr alia, it is located a short distance (55 km) from Sydney . In 2000 this area was added to the “World Heritage Lis...
【单选题】Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s—more than 250 time...