本课配套习题挑战模式1/5

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单选题
难度系数:

1.如图,已知正方形ABCD的边长为4,点M在DC上,DM=1,点N是AC上的一个动点,那么DN+MN的最小值是(  )
A: 3
B: 4
C: 5
D: 6
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