[单选题]设G为有n个结点的简单图，则有
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Btitle="QQ图片20200304111157.png" alt="QQ图片20200304111157.png" src="http://wx.hbjxjyw.com/UploadFiles/88/2020-3/6371891712965936349913576.png"/>G.title="QQ图片20200304111230.png" alt="QQ图片20200304111230.png" src="http://wx.hbjxjyw.com/UploadFiles/88/2020-3/6371891716252940946292445.png"/>
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