A:play, him
B:plays, himself
C:playing, himself
D:playing, him
若等腰三角形的顶角为α,则它一腰上的高与底边的夹角等于( )
如图1,△ABE是等腰三角形,AB=AE,∠BAE=45°,过点B作BC⊥AE于点C,在BC上截取CD=CE,连接AD、DE并延长AD交BE于点P;
下图是我国某地区气温、降水量和蒸发量年内分布示意图,回答问题。