题干
下列有关命题的说法正确的是
A：命题“若，则”的否命题为：“若，则”．
B：“”是“”的必要不充分条件．
C：命题“使得![](http://tiku.21cnjy.com/tikupic/1a/29/1a7292d3e636d56ab3 </p>
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<a href="/question/3510741.html">上一题</a> <a href="/question/3510743.html">下一题</a> 0.0难度 选择题 更新时间:2019-06-29 06:05:22
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D
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已知圆心在x轴上、半径为 <math xmlns=)