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【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.
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【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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【简答题】John's main problem is getting good quality __
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【判断题】杆件在线弹性范围内扭转变形时,切应变与扭转角成正比。
A.
正确
B.
错误
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【单选题】The vortex lift generated by the leading-edge vortex can reach ____ of the total lift.
A.
More than 10%
B.
More than 20%
C.
More than 30%
D.
More than 40%
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【简答题】The professor suggests John apply for a __
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【单选题】如图所示等截面直杆,其支座约束和受力如图所示。其轴线在变性后的位置(图中虚线所示)有四种答案,根据弹性体变形的特点,请问哪一种是合理的
A.
B.
C.
D.
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【判断题】纯剪切是指单元体上只有切应力而无正应力。
A.
正确
B.
错误
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【简答题】The professor will check the__ information in John's written report.
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【多选题】The influences of wingtip trailing vortex are: ____.
A.
The efficiency of the airport
B.
The efficiency of aircraft’s take-off and landing
C.
The lift of the plane
D.
Increase the induced drag
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【简答题】Its colour comes from an uncommon __
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