A:She likes banana
B:She is 23
C:She is a nurse
D:She is friendly and helpful
如图所示,BD是∠ABC的平分线,DE⊥AB于点E,AB=36cm,BC=24cm,S△ABC=144cm,则DE的长是____ .
在你的家里,下列哪一项列举的都是生物 ( )