8.抛物线y=a1x2+b1x+c1绕点(0,2)旋转180°得到抛物线y=a2x2+b2x+c2,则下面等式成立的是( )
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| A. | a1-a2=0 | B. | b1+b2=0 | C. | c1+c2=4 | D. | $\frac{{b}_{1}}{{a}_{1}}$=$\frac{{b}_{2}}{{a}_{2}}$ |