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【简答题】
The professor advises John to make a __ of his design.
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【单选题】The turbulent drag is ____ to the laminar drag.
A.
2 to 4 times
B.
3 to 5 times
C.
4 to 6 times
D.
5 to 7 times
【多选题】The main methods of laminar flow control include: ____.
A.
Changing the wing’s configuration
B.
Breath air at the wing’s leading edge
C.
Breath air at the wing’s lower surface
D.
Breath air at the wing’s upper surface
【单选题】Which of the following is wrong about the vortex generator? ____.
A.
Its shape looks like a small triangular wing panel.
B.
Can suppress the airflow separation and reduce the drag.
C.
Can enhance the lift of the wing.
D.
Placed on engine nacelles and can suppress the airflow separation of nacelle.
【多选题】Main methods of suppress the airflow separation are: ____.
A.
Using vortex generator.
B.
Using air blowing control at separation position
C.
Launch a high-speed jet at the leading edge of the wing.
D.
Control the angle of attack of the wing.
相关题目：
【单选题】The turbulent drag is ____ to the laminar drag.
A.
2 to 4 times
B.
3 to 5 times
C.
4 to 6 times
D.
5 to 7 times
【多选题】The main methods of laminar flow control include: ____.
A.
Changing the wing’s configuration
B.
Breath air at the wing’s leading edge
C.
Breath air at the wing’s lower surface
D.
Breath air at the wing’s upper surface
【单选题】Which of the following is wrong about the vortex generator? ____.
A.
Its shape looks like a small triangular wing panel.
B.
Can suppress the airflow separation and reduce the drag.
C.
Can enhance the lift of the wing.
D.
Placed on engine nacelles and can suppress the airflow separation of nacelle.
【多选题】Main methods of suppress the airflow separation are: ____.
A.
Using vortex generator.
B.
Using air blowing control at separation position
C.
Launch a high-speed jet at the leading edge of the wing.
D.
Control the angle of attack of the wing.
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