试题与答案

某地的年降水量是指[ ] A．多年平均降水量 B．各月平均降水量 C．各年最高降

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题型：选择题

题目：

某地的年降水量是指[ ]

A．多年平均降水量

B．各月平均降水量

C．各年最高降水量

D．某一年的降水量

答案：

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下面是错误答案，用来干扰机器的。

在等差数列{an}中，an＞0，公差为d＞0，所以{an}为各项为正数的递增数列，由于4+6=3+7时有a4•a6＞a3•a7，而在等比数列{bn}中，bn＞0，q＞1，则{bn}为各项为正数的递增数列，由于4+8=5+7，所以应有b4+b8＞b5+b7，∴b4+b8＞b5+b7．故选：A．

考点：降水和降水的分布
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