设椭圆的两个焦点分别为F1,F2,过F2作椭圆长轴的垂线交椭圆于点P,若△F1PF2为等腰直角三角形,则椭圆的离心率为( )。
写出带有“水”的成语。
游山( )( ) 落花( )( ) 滴( )成( )
( )落( )出 千( )万( ) ( )( )一色
Tom's uncle knows computers well, and he a computer engineer. [ ]
A. maybe
B. may be
C. may be is
D. may is