A rescue plan could be achieved by sending an unmanned （ ） to the space station. ( 章节：4 难度：4)
- A、short course of study
- B、satellite
- C、module
- D、self-contained separable unit
正确答案:C
答案解析:有
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A rescue plan could be achieved by sending an unmanned （ ） to the space station. ( 章节：4 难度：4)
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