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【单选题】
方程Ax2+Bxy+Cy2+Dx+Ey+F=0表示一个圆的充要条件是( )A.
A=C，B=0
B.
A=C≠0，B=0
C.
A=C≠0，B=0，D²+E²-4F﹥0
D.
A=C≠0，B=0，D²+E²-4AF>0
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