The longest composite panels in the world come from ____ aircraft.
A. B747
B787
C. A380
D. A350XWB
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During the development and application of the composite materials, we should put ____ as the top priority.
A. Designability
B. Safety
C. Adaptability
D. Cost-effective
Which one belongs to the payload of the "Chang'e-1"? ____.
A. Star sensors
B. Imaging spectrometer
C. Attitude control engines
D. Solar panels
The core module of manned spacecraft is ____.
A. The experiment module
B. The orbital module
C. The re-entry module
D. The service module
____ space stations have been launched in the world so far.
A. 8
B. 10
C. 12
D. 14
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