Which following re-entry mode has the largest overload? ____
A. Purely ballistic
B. Semi-ballistic
C. Jumping
D. Gliding
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The “Spirit” Mars pathfinder from the US has adopted ____ soft landing.
A. Landing leg type
B. Airbag bounce type
C. Aerial crane type
D. Rocket thrust
Nowadays computer and computer technology has completed ____ of the work in aircraft design and manufacture.
A. More than 50%
B. More than 60%
C. More than 70%
D. More than 80%
CFD could be a substitution of wind tunnel tests under ____.
A. High angle of attack situation
B. Normal wind tunnel tests
C. Separate flow situation
D. Complex flowing control situation
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