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【单选题】
The black barrier area is located in ____ of the spacecraft’s return orbit.
A.
Deorbit stage
B.
Transition stage
C.
Re-entry stage
D.
Landing stage
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Students entering the design competition have to
A.
produce an energy-efficient design.
B.
adapt an existing energy-saving appliance.
C.
develop a new use for current technology.
【多选题】Which following is true about the re-entry angle of the spacecraft’s return stage? ____.
A.
The re-entry angle is the angle between the direction of the spacecraft’s flight speed and the local horizon.
B.
If the re-entry angle is too small, the spacecraft might been destroy due to high temperature.
C.
If the re-entry angle is too large, the spacecraft might skim the atmosphere.
D.
If the re-entry angle is too large, the spacecraft might been destroy due to high temperature.