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【单选题】
下列描述中错误的是( ) 1 在用定义证明数列极限时,正整数 的选取与 有一定的关系,但关系不大。 2在用定义证明数列极限 时,对于的 ,我们只能够通过解不等式 来找到唯一确定的正整数 。 3在用定义证明数列极限 时,对于的 ,如果当 有 ,则比 大的正整数都可以作为定义中的 。 4在用定义证明数列极限 时,如果对于取定的 ,不等式 无解,这就说明数列 的极限不可能是 。
A.
①② ④
B.
①②
C.
③④
D.
②④
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