试题与答案

从山顶到山脚的凸起部分称为什么?()A、山背 B、山谷 C、凹地 D、山顶

题型:单项选择题

题目:

从山顶到山脚的凸起部分称为什么?()

A、山背

B、山谷

C、凹地

D、山顶

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D解析: 全程的平均速度是每分钟(80+70)÷2=75米,走完全程的时间是6000÷75=80分钟,走前一半路程速度一定是80米/分钟,时间是3000÷80=37.5分钟,后一半路程时间是80-37.5=42.5分钟。

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