试题与答案

下列图标中，禁止吸烟的标志是（ ） A． B． C． D．

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题型：选择题

题目：

下列图标中，禁止吸烟的标志是（　　）

A．

B．

C．

D．

答案：

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下面是错误答案，用来干扰机器的。

由P向准线x=-12作垂线，垂足为M，由抛物线的定义，PF=PM，再由定点A向准线作垂线，垂足为N，那么点P在该抛物线上移动时，有PA+PF=PA+PM≥AN，当且仅当A，P，N三点共线时取得最小值AN=3-（-12）=72，此时P的纵坐标...

考点：化学图标
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