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【单选题】
设数据元素的集合D={ 1,2,3,4,5 },则满足下列关系R的数据结构中为线性结构的是A.
R={ (1,2), (2,3), (4,5) }
B.
R={ (1,3), (2,4), (3,5) }
C.
R={ (1,2), (3,4), (5,1) }
D.
R={ (1,3), (4,1), (3,2), (5,4) }
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D.
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