8.
如图,⊙O的半径为10,A是⊙O上一点.以OA为对角线作矩形OBAC,且OC=6.延长BC,与⊙O分别交于D,E两点,则△OCE和△OBD的周长差等于( )
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| A. | $\frac{3}{5}$ | B. | $\frac{4}{5}$ | C. | 1 | D. | $\frac{6}{5}$ |