2. 外语
  3. ______has been explored by 15 spacecraft? ______has a weak magnetic field?

______has been explored by 15 spacecraft? ______has a weak magnetic field?

admin2009-06-24  33
问题 ______has been explored by 15 spacecraft?
______has a weak magnetic field?
选项 A、 
B、 
C、 
答案C
解析
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