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【单选题】
如果圆心O到直线l的距离等于半径R，则直线l与圆的位置关系是（　　）
A.
相交
B.
相切
C.
D.
相切或相交
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颊沟的近中
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【简答题】I live in the middle of a large university, and I see superstition in its four manifestations, alive and flourishing among people who are indisputably rational and learned.
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【简答题】Superstition is a part of British culture today. Although superstition was more alive a hundred years ago, there are still superstitious people around, both young and old. I will talk about it from fo...
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