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Infig.1,let beanequilateraltriangle,DandEbepointsonedge...
问题详情:Infig.1,let beanequilateraltriangle,DandEbepointsonedgesABandACrespectively,FbeintersectionofsegmentsBEandCD,and,thenthemagnituderelationbetweenAdandCEis( ) A. B. C. D.indefinite...