P0B的精选

问题详情：设△ABC，P0是边AB上一定点，满足P0B＝AB，且对于边AB上任一点P，恒有·≥·，则( )A．∠ABC＝90°                  B．∠BAC＝90°＝AC                       D．AC＝BC【回答】D知识点：...