The control effectiveness of elevator will under the ground effect（）
A. increase
B. decrease
C. remain unchanged
D. [ / ]
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On the mean aerodynamic chord, among the following four points, the most forward one is（）
A. Stick-fixed neutral point
B. Stick-free neutral point
C. Stick-fixed maneuver point
D. Stick-free maneuver point
Wing contribution on longitudinal static stability depends on CG location, CG moves forward, the stability（）
A. decreases
B. increases
C. doesn’t change
D. depends on Mach number
Which of the following factors is not related to the tail contribution on longitudinal static stability（）
A. Horizontal tail area
B. Distance between CG and horizontal tail aerodynamic center
C. Downwash angle of the horizontal tail
D. setting angle of the horizontal tail
About ground effect, Which of the following statements are true（）
A. Wing lift-curve slope increases
B. Tail lift-curve slope increases
C. Neutral point moves forward
Downwash angle increases
E. Most forward CG location moves aftward
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