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【单选题】
关于网状数据库,以下说法正确的是A.
只有一个结点可以无双亲
B.
一个结点可以由多于一个的双亲
C.
两个结点之间只能有一种联系
D.
每个结点有且只有一个双亲
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A.
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B.
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A.
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B.
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