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【简答题】
设y=f(x)是偶函数且其图像对称于直线x=a(a＞0)，证明f(x)是周期函数．
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【简答题】Hugh's "Early Autumn" is a story about past love, which tells some truth of real life in a melancholy and sentimental style. The feelings of two characters' are quite different according to their pres...
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