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