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【单选题】
【2019下】对于如下所示的有向图,采用邻接链表存储时顶点1的表结点个数为2,顶点5的表结点个数为0,顶点2和3的表结点个数分別为( )
A.
2.1
B.
2.2
C.
3.4
D.
4.3
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D.
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A.
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A.
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B.
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A.
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B.
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C.
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D.
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