题目内容

The civil turbofan engine with good performance now has a bypass ratio nears ____.

A. 6
B. 8
C. 10
D. 12

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Which of the follow aircraft's engine equipped with thrust vectoring technology? ____.

A. First generation
B. Second generation
C. Third generation
D. Fourth generation

The thrust generated by propellers of turboprop engines took ____ of the total thrust.

A. 10%
B. 50%
C. 75%
D. 90%

The compression of air is finished in the ____ of ramjet.

A. Intake ducts
B. Compressor
C. Turbines
D. Nozzle

The "Helios" UAV of the United States have ____ propellers.

A. 10
B. 12
C. 14
D. 16

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