无向图的邻接矩阵一定是（）。
- A.对角矩阵
- B.稀疏矩阵
- C.三角矩阵
- D.对称矩阵
正确答案及解析
正确答案
解析
本题考查图的存储结构基本知识。
图的邻接矩阵表示法是利用一个矩阵来表示图中顶点之间的关系。对于具有n个顶点的图G=（V，E）来说，其邻接矩阵是一个n阶方阵，且满足
某有向图和无向图的邻接矩阵如下图所示。
显然，在无向图中，若存在边（Vi， Vj），则一定存在边〔Vj，Vi），因此，无向图的邻接矩阵一定是对称矩阵。
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