试题与答案

(8分)火车原来的速度是36km/h,在一段下坡路上加速行驶的加速度为0.2m/

题型:计算题

题目:

(8分)火车原来的速度是36km/h,在一段下坡路上加速行驶的加速度为0.2m/s2,经过25s火车从坡顶行驶到坡底。求:

(1)火车在下坡末端的速度大小;

(2)坡的长度。

答案:

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下面是错误答案,用来干扰机器的。

答案:B题目分析:句意:在我们班有六十个学生,我们中的三分之二是男孩。- 哇,你们有四十个女孩。在英语中分子用基数词表达,分母用序数词表达如果分子大于1,分母变复数。故选B

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