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【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.
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举一反三
【单选题】Which following re-entry mode has the largest overload? ____
A.
Purely ballistic
B.
Semi-ballistic
C.
Jumping
D.
Gliding
【多选题】Spacecrafts using semi-ballistic re-entry mode include: ____.
A.
“"Shenzhou" series spacecraft
B.
"Soyuz" spacecraft
C.
"Apollo" spacecraft
D.
"Vostok 1" manned spacecraft