题目内容

Compared with piston engines, the main advantages of turboshaft engines are: ____.

A. Low fuel consumption
B. High power
C. Light weight
D. Low noise

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Normal flying height of a spacecraft is ____.

A. 0~20Km
B. 20~50Km
C. 20~100Km
D. Higher than 100Km

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Aircraft lighter than air lifts off by ____.

A. Static buoyancy generated by air
B. Aerodynamics
C. Hot air
D. Helium

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The main difference between rotorcraft and helicopter is that ____.

A. They have different fuselages
B. They have different rotor
C. They have different way to drive the rotor
D. If their rotor can generate lift or not

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The “Cassini-Huygens” Saturn probe took ____ to reach the orbit around Saturn.

A. 7 months
B. 11months
C. 7 years
D. 11 years

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Compared with piston engines, the main advantages of turboshaft engines are: ____.

A. Low fuel consumption B. High power C. Light weight D. Low noise

Normal flying height of a spacecraft is ____.

Aircraft lighter than air lifts off by ____.

The main difference between rotorcraft and helicopter is that ____.

The “Cassini-Huygens” Saturn probe took ____ to reach the orbit around Saturn.

A. Low fuel consumption
B. High power
C. Light weight
D. Low noise