A:1,+∞
B:-∞,0
C:0,+∞
D:-∞,1
如图,△DEF是由△ABC通过平移得到,且点B,E,C,F在同一条直线上.若BF=14,EC=6.则BE的长度是( )
如图,在▱ABCD中,BE=DF.求证:AE=CF.
The mother turtle l____ her new-born eggs in the sand then went back to the sea.