5.
如图,⊙O1与⊙O2外切点A,半径为r1,r2,PB,PC分别为两圆的切线,B,C为切点,PB:PC=r1:r2,又PA交⊙O2于点E,则下面结论不正确的是( )
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| A. | S△PAB:S△PCE=r12:r22 | B. | PA:PD=r2:r1 | ||
| C. | AE:AD=r2:r1 | D. | PB:PD=r2:r1 |