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【单选题】
以下命题中正确的是 （ ）A.
恒成立；
B.
在 中，若 是等腰三角形；
C.
对等差数列 的前 ，若对任意正整数 都有 对任意正整数 恒成立；
D.
是直线 与直线 平行且不重合的充要条件；
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