一元二次方程x2-5x-6=0的根是( )
A:1,-6
B:2,-3
C:-1,6
D:-2,3
The sun is ________ bigger than the Earth.
若△ABC内有一点O,满足OA→+OB→+OC→=0→,且OA→·OB→=OB→·OC→,则△ABC一定是( )