When asked about his future plans, the president expressed the desire to step aside ________ the younger men.
已知,如图,在△ABC中,OB和OC分别平分∠ABC和∠ACB,过O作DE∥BC,分别交AB、AC于点D、E,若BD+CE=5,则线段DE的长为( )
若ab=0,则P(a,b)在( )
关于我国的地势特点的说法,正确的是