A:turned o
B:turned i
C:turned around
D:turned out
下列能正确反映北宋与少数民族政权并立的示意图是( )
________are in the same class. We are good friends.
如图,F在BD上,BC、AD相交于点E,且AB∥CD∥EF,
(1)图中有哪几对位似三角形,选其中一对加以证明;
(2)若AB=2,CD=3,求EF的长.