Which following is true about the re-entry angle of the spacecraft’s return stage? ____.
A. The re-entry angle is the angle between the direction of the spacecraft’s flight speed and the local horizon.
B. If the re-entry angle is too small, the spacecraft might been destroy due to high temperature.
C. If the re-entry angle is too large, the spacecraft might skim the atmosphere.
D. If the re-entry angle is too large, the spacecraft might been destroy due to high temperature.
查看答案
Spacecrafts using semi-ballistic re-entry mode include: ____.
A. “"Shenzhou" series spacecraft
B. "Soyuz" spacecraft
C. "Apollo" spacecraft
D. "Vostok 1" manned spacecraft
The lunar probes adopt landing leg type soft landing are: ____.
A. "Chang'e-3"
B. "Phoenix"
C. "Apollo" spacecraft
D. "Curiosity"
The main branches of aerodynamics include: ____.
A. Computational aerodynamics
B. Experimental aerodynamics
C. Structural aerodynamics
D. Aerodynamics of prototype’s flight test
The main stages in aerodynamic design method and process of aircraft include: ____.
A. The investigation and demonstration
B. The concept and preliminary design
C. The wind tunnel test and verification
D. The flight tests
微信支付 
支付宝支付