关于珠江三角洲外向型经济的叙述,正确的是( )
如图,AB为⊙O的直径,延长AB至点D,使BD=OB,DC切⊙O于点C,点B是的中点,弦CF交AB于点E.若⊙O的半径为2,则CF=____ .
— At last, both of them died in the war.
一 Oh. that's touching.