设圆上有关于直线对称的两点，则的值为（） A． -1 B．

设圆上有关于直线对称的两点，则的值为（）

A． -1 B．1 C．-2 D．2

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设圆上有关于直线对称的两点，则的值为（ ） A． -1 B．

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设圆上有关于直线对称的两点，则的值为（） A． -1 B．