题目内容

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

查看答案

搜索结果不匹配？点我反馈

更多问题

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

The US space shuttle has ____ main engines.

A. 3
B. 4
C. 5
D. 6