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When were the shuttle and telescope moved into a higher orbit?

admin2014-05-14  25
问题 When were the shuttle and telescope moved into a higher orbit?
Astronauts have moved the American shuttle Discovery and the Hubble telescope into a higher orbit. They took the action when part of the unexploded rocket was expected to pass within less than a kilometer from the space craft. Earlier the astronauts made repairs to the telescope that would permit experts to look deeper into space than ever before.
选项 A、Before the telescope was repaired.
B、After the rocket was exploded.
C、When the rocket was within less than a kilometer from the spacecraft.
D、When the experts could look deeper into space than ever before.
答案C
解析
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