The development trend in structural design of aircraft includes: ____.
A. From isotropic structure to anisotropic structure
B. From metals to nonmetals
C. From structural weldments to integral parts
D. From common structure to intelligent material structure
查看答案
The methods for space probe detect planets include: ____.
A. Probe by orbiting
B. Sampling and return
Close observation by passing close
D. On-site investigations
A spacecraft generally consists of several parts such as: ____.
A. The re-entry module
B. The orbital module
C. The living module
D. The service module
The space station is mainly composed of: ____.
A. The re-entry module
B. The working module
C. The living module
D. The transition module
The space shuttle consists of: ____.
A. The rocket booster
B. The external tank
C. The orbiter
D. The living module
微信支付 
支付宝支付