下列图中是欧拉图的有( ) 。
A.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0601/1590998160971479.png" />
B.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0601/1590998184515083.png" />
C.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0601/1590998200590963.png" />
D.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0601/1590998214575081.png" />
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正确答案： B 答案分析：无
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