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МатематикаВопрос:
3. What is the earliest form of air transport?
Ответ:
Самая ранняя форма воздушного транспорта:
- Воздушные шары: они были первыми летательными аппаратами, которые использовали люди для подъема в воздух и перемещения на небольшие расстояния.
Ответ: Воздушные шары.
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- 2. What is the great advantage of air transport?
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- 5. How are balloons used at present?
- 6. When was the first aeroplane flight made?
- 7. What event quickened the development of aeroplanes enormously?
- 8. How did aeroplanes change by 1918?
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- 12. What is another important use of air transport besides carrying passengers?
- 13. Is it likely that aircraft will ever replace ships?
- 14. When were helicopters first introduced for regular airline service?
- 15. How were helicopters used later?
- 16. How do helicopters gain and lose in their technical characteristics?
- 17. What kind of machine was developed to combine the advantages of helicopter with the high speed of an ordinary aircraft?
