不定项选择题:卫星要保持多快的速度才能环绕地球运行?(  )

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题目内容:
卫星要保持多快的速度才能环绕地球运行?(  ) A.大于11.2千米/秒,小于16.4千米/秒
B.大于7.9千米/秒,小于11.2千米/秒
C.大于16.4千米/秒,小于18.2千米/秒
D.大于7.9千米/秒,小于16.4千米/秒
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