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【单选题】
设 是平庸空间, ,则( )A.
B.
, 且点 有且只有一个邻域
C.
, 点 有且只有一个开邻域
D.
上述全部正确
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【简答题】阅读理解 Tom, an 11-year-old boy, was ill. He had got a cough, and his mother was worried and took him to see a doctor. The doctor looked over Tom carefully and said, 'Tom, nothing serious.' Then he gave ...
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【简答题】阅读理解（40分） Tom , an 11-year-old boy, was ill. He had got a cough. His mother was worried and took him to see a doctor. The doctor looked over Tom carefully and said,' Tom, nothing serious.' Then he g...
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