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【单选题】
下列命题中：①函数 的最小值是 ；②在 中，若 ，则 是等腰或直角三角形；③如果正实数 满足 ，则 ；④如果 是可导函数，则 是函数 在 处取到极值的必要不充分条件。其中正确的命题是（ ）A.
①②③④
B.
①④
C.
②③④
D.
②③
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