题干
下列说法正确的是（ ）
A：“”是“上为增函数”的充要条件
B：命题“使得”的否定是：“”
C：“”是“![](http://tiku.21cnjy.com/tikupic/53/b9/53bb9d0e65e31d76c26e50ca66dcb3ca.png </p>
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<h2 class="title daan" data="4527772">答案(点此获取答案解析）</h2>
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A
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<h2 class="title">同类题1</h2>
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— _________? <br>—I)