400-600-1123
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答案：
C
条件一当中
只涉及到了r和s的情况，判断不出，不充分
条件二，（r，s）和（1-r，1-s）只能说明两个点的位置关系，但不能证明他们到原点的距离相等
联立，可证两个点为：（r，1-r）和（1-r，r），关于原点对称，正确 
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