题目内容

The main characteristics of a piston engines include: ____.

A. More efficient when flying at low speed
B. Are direct reaction engines
C. When the aircraft's flight speed exceeds 700-800 kilometers per hour, the propulsion efficiency will also drop sharply
D. Widely used in some small and low-speed aircraft

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The core components of the turbojet include: ____.

A. Intake duct
B. Compressor
Combustion chamber
D. Turbine

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The characteristics of ramjet includes: ____.

A. Complex structure
B. Inefficient when the aircraft is flying at low speed
C. Good intake and compression performance when the aircraft is flying at low speed
D. Usually used in combination with other types of engines

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The power source of electric power device mainly comes from: ____.

A. Solar cell
Battery
C. Wind energy battery
D. Fuel cell

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The advantages of rocket engine compared with aeroengine include: ____.

A. The thrust is not affected by the flight attitude
B. Larger thrust
C. High thrust-to-weight ratio
D. Self-contained combustion agent

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The main characteristics of a piston engines include: ____.

A. More efficient when flying at low speed B. Are direct reaction engines C. When the aircraft's flight speed exceeds 700-800 kilometers per hour, the propulsion efficiency will also drop sharply D. Widely used in some small and low-speed aircraft

The core components of the turbojet include: ____.

The characteristics of ramjet includes: ____.

The power source of electric power device mainly comes from: ____.

The advantages of rocket engine compared with aeroengine include: ____.

A. More efficient when flying at low speed
B. Are direct reaction engines
C. When the aircraft's flight speed exceeds 700-800 kilometers per hour, the propulsion efficiency will also drop sharply
D. Widely used in some small and low-speed aircraft