The satellite sent into space in ______ is in orbit ______ above earth.
发布时间:2024-05-12 10:27:47
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the 1990s; 450 km
B:the 1990; 450 km
C:the 1990s; 450 kms
D:the 1990; 450 kms
2 The rising population of space debris increases the potential danger to all space vehicles, but especially to the International Space Station, space shuttles and other spacecrafts with humans on board.
The first Beidou satellite has not been retired.
B:China launched the final satellite of BDS successfully on July 23, 2020.
C:China should have its own satellite navigation system in the navigation application market.
D:The 55th Beidou satellite was sent into space from the Jiuquan Satellite Launch Center.