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【单选题】
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
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参考解析：
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【多选题】The lunar probes adopt landing leg type soft landing are: ____.
A.
"Chang'e-3"
B.
"Phoenix"
C.
"Apollo" spacecraft
D.
"Curiosity"
【多选题】The main branches of aerodynamics include: ____.
A.
Computational aerodynamics
B.
Experimental aerodynamics
C.
Structural aerodynamics
D.
Aerodynamics of prototype’s flight test
【单选题】In the holding chamber, the carbon dioxide
A.
changes back to a gas.
B.
dries the dishes
C.
is allowed to cool.
【单选题】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%