2. 外语
  3. Airplane Engines In 1945 a new type of airplane engine was invented. / It was much lighter and more powerful than earlier e

Airplane Engines In 1945 a new type of airplane engine was invented. / It was much lighter and more powerful than earlier e

admin2010-01-15  34
问题  
选项
答案 Airplane Engines In 1945 a new type of airplane engine was invented. / It was much lighter and more powerful than earlier engines, / and enabled warplanes to fly faster and higher than ever. / This type of engine was called the jet engine / because it blows a large jet of hot air backwards at high speed. / The first airplane to use the new jet engine was built in Britain / and it began carrying passengers in 1952. / It had two jet engines and flew much higher than petrol-engine airplanes. / At this height the air is thinner and very cold, / and so the airplane can cut through the air more easily. / However, the cabin has to be air-conditioned and has to be at normal pressure / so that the passengers may eat, read and sleep in comfort. / Today all long-distance airplanes have jet engines. / The modern jet airplanes are very big and can carry hundreds of passengers on two different floors, / which makes air travel much cheaper.
解析
转载请注明原文地址:https://jikaoti.com/ti/l05MFFFM
0

专业英语四级

相关试题推荐
随机试题
最新回复(0)