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【单选题】
对图G中各个结点分别指定一种颜色，使相邻结点颜色不同，则称为图G的一个正常着色。正常着色图G所必需的最少颜色数，称为G的色数。那么下图的色数是（ ）。【图片】A.
3
B.
4
C.
5
D.
6
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