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【单选题】
圆的对称集中的元素有()个。
A.
1.0
B.
2.0
C.
无穷多条
D.
1.0
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【单选题】To be admitted to the Open University, one needs ______.
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【简答题】选择正确的答案。 (     ) 1. Close your book. (     ) 2. Open the window. (     ) 3. Open the door. (     ) 4. Open your book. (     ) 5. Close the window. (     ) 6. Close the door. A. 打开窗户。 B. 关上门。 C. 打开你的书。...
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