∴AB2+BC2=AC2,
∵CD⊥AD,
∴∠ADC=90°,
∴AD2+CD2=AC2,
∵AD2+CD2=2AB2,
∴AC2=2AB2,
∴AB
I think _______ you will like him.
冠心病是由下列哪种血管发生病变引起的?( )