下列选项中，是的必要不充分条件的是 A．：：且B. ：

下列选项中，是的必要不充分条件的是

A．：：且B. ：：

C. ：是纯虚数：

D. ：在上单调递增：

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下列选项中，是的必要不充分条件的是 A．： ：且B. ：

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下列选项中，是的必要不充分条件的是 A．：：且B. ：