如图,AB是⊙O的直径,点C在AB的延长线上,CD切⊙O于点D,过点D作DF

如图,AB是⊙O的直径,点C在AB的延长线上,CD切⊙O于点D,过点D作DF⊥AB于点E,交⊙O于点F,OE=1cm,DF=4cm,则CB的长为
A.B.C.D.4

答案

p;【答案】B解析:
p;【解析】略

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